Can you create a text file (two lines) with a text editor such mousepad, pluma, and the like?

If you can, it should not be a problem to create a simple ALSA config.

Do you want to use pulseaudio, or it can be removed?

Yes. To avoid troubles, one has to use the names.

$ cat /proc/asound/cards
 0 [system         ]: USB-Audio - iMic USB audio system
                      Griffin Technology, Inc iMic USB audio system at usb-0000:00:1a.0-1.3.4, full s

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: system [iMic USB audio system], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Card number: 0   Name: "system"

This is config generated by arateconf:

$ cat $HOME/.asoundrc
# ALSA library configuration file managed by arateconf.
#
# MANUAL CHANGES TO THIS FILE WILL BE OVERWRITTEN!
#
# Manual changes to the ALSA library configuration should be implemented
# by editing the ~/.asoundrc file, not by editing this file.

#=====================================================
# Configuration for system
#-----------------------------------------------------

# Perform dmixer
pcm.dmixer
{
	type			dmix
	ipc_key			1024
	ipc_perm		0666

	hint
	{
		show		off
		description	"Direct mixing of multiple audio streams"
	}

	slave
	{
		pcm		"hw:system,0"

		rate		48000
		channels	2
		format		S16_LE

		period_size	1920
		buffer_size	7680
	}
}

# Perform dsnooper
pcm.dsnooper
{
	type			dsnoop
	ipc_key			1025
	ipc_perm		0666

	hint
	{
		show		off
		description	"Recording from the same device for several applications simultaneously"
	}

	slave
	{
		pcm		"hw:system,0"

		rate		48000
		format		S16_LE

		period_size	1920
		buffer_size	7680
	}
}

# Perform duplex
pcm.duplex
{
	type			asym
	playback.pcm		"dmixer"
	capture.pcm		"dsnooper"

	hint
	{
		show		off
		description	"Full duplex for simultaneous playback and recording"
	}
}

# Perform convert
pcm.convert
{
	type			rate
	converter		fftrate

	hint
	{
		show		off
		description	"Sample rate converter"
	}

	slave
	{
		pcm	"duplex"
		rate	48000
		format	S16_LE
	}
}

#=====================================================
# Configuration for default audio device
#-----------------------------------------------------

# Perform plug device
pcm.!default
{
	type			plug
	slave.pcm		"convert"
	hint.description	"Default device"
}

Can you create two ALSA configs (with different default devices) with arateconf?

For example:
1. Create a config with arateconf and save it.
2. Open it with a text editor a save a copy of it, for example:

pluma $HOME/.asoundrc 

mousepad $HOME/.asoundrc 

echo $HOME

3. Create another config and save a copy of it.

Have you tested this method?

It works without problems.

If a problem occurs, the user can restart mpv player.

You are avoiding to answer the question, because you are not going to take any responsibility for your statements, because you cannot trust them.

EDIT:

Would you trust a security expert who does not trust his senses and his ability to think?

1. If ALSA is so good, why do you need pulseaudio or pipewire?

2. Do you trust your senses and your ability to think?

Did you have problems with sound and sound quality in 2000? Or it worked out of the box?

/usr/local/bin is the standard solution.

cmake -D CMAKE_INSTALL_PREFIX=/usr/local  < + other options: -S (sourcedir), etc.>

However, debhelper (Devuan) does not permit /usr/local/bin (by default).
Though, there is a secret esoteric command to force debhelper to permit prefix=/usr/local
In any case, it is much easier to package it manually, or with CPack .
You may want to rename the deb package, and ProjectName

project( )  is inside CMakeLists.txt

To compile it, you need cmake and ninja

EXAMPLE for cmake+ninja
_https://dev1galaxy.org/viewtopic.php?id=7175

Do you think that it is the simplest solution?

You may not use your gksu.sh with file. mediainfo, and the like.

So that, one desktop launcher, and one script which can be modified for the current needs.
You can simply uncomment the command you need.
NOTE: Filenames and paths with spaces should be supported.

If it is about security, then

Exec=gksu.sh /usr/bin/apt-get install %f

Linux Mint has two different apt

/usr/bin/apt
/usr/local/bin/apt

_https://github.com/linuxmint/mintsystem/blob/master/usr/local/bin/apt

This is not acceptable. It should be like this:

Terminal=false

There are many experts on security, on sound, on ALSA, and on everything else, who cannot write a simple script and cannot compile anything. Such "universal experts", as a rule, have affinity to censorship. This affinity can manifest in various ways, from individual tendencies to participate in online content moderation to governmental actions that suppress certain forms of speech.

Because of pulseaudio, systemd, and pipewire, many users left Linux. As a result, the percentage of "universal experts" on Linux forums has significantly increased. They know little about Linux, but they can censor everything.

The problem is that such "universal experts" tend to overestimate their knowledge and underestimate their ignorance. To protect their overblown ego from the reality that challenges it, they have to censor everything they do not understand. That is why, they often attempt to censor jokes. For the same reason, they hate AI and strive to abolish it. Though there might also be economic reasons for AI hate. The "universal experts" may feel that they can be replaced by AI in the same way as Luddites were replaced by machines during the Industrial Revolution. They have to fear AI, because they do not trust their ability to think. To be enslaved by fear, one must relinquish trust in his God-given ability to think.

Since apt is a sort of "unstable wrapper", it may lacks the full features of apt-get to unbreak things.

There are "security experts", who cannot write simple scripts, and cannot compile anything.

The standard solution:

1. bash script with one simple command inside

2. desktop launcher for it

Right click on a deb file and select "install deb".
It opens a terminal, and runs "sudo dpkg -i <your deb>" on it.

gksu is not needed.

"local .deb packages" can be installed with "dpkg" or with "apt" (together with dependencies, if available) similar to "gdebi".