WebCord is an “alternative client” for Discord, although it’s just running the Discord webpage in electron. Recently it updated its electron version so it supports sharing audio as well as video.
I tried it out today on mint (x11, pulseaudio) and it works flawlessly.
Yeah it’s fine right now, but these companies are prone to changing their minds. I think it’s a good option but also wouldn’t put it past discord to suddenly decide to crack down one day.