Glad I found this thread. I'm running Ceres(sysv) and Hyprland and added all pipewire packages and then added this to my hyprland.conf and bluetooth works as it does on Sid(systemd) with Hyprland

exec-once = wireplumber &
exec-once = pipewire &
exec-once = pipewire-pulse &

I didn't run bluetooth back in the Debian sysv days before systemd so wasn't sure.