I need a way to set mono audio output on my system.

I had used this solution before: Can I downmix stereo audio to mono?

pacmd load-module module-remap-sink sink_name=mono master=NAME_OF_AUDIO_SINK 

 channels=2 channel_map=mono,mono

However, it stopped working when I upgraded to Kubuntu 22.10, presumably because it now uses PipeWire instead of PulseAudio. When I do pacmd list-sinks I get:

No PulseAudio daemon running, or not running as session daemon.

How can I do the same (downmix stereo audio output to mono) on PipeWire?

I found here a solution to a similar problem, but if I understand correctly that's for getting mono input. I want mono output.

Even better if I can easily switch it to mono/stereo using GUI, or set it to mono only when my stupid earphones are connected.

PS: They should really implement Mono Sound as a profile/configuration on System Settings > Audio, but oh well...