the audio is inexcusably inconsistent on my pinephone, particularly the mic.

A good mobile friendly GTK nextcloud talk app. I love nextcloud and I love my pinephone but having to use the browser is a massive pain.

IMHO we are a long way off from that being a good idea even if the app existed. I may make jokes about it but I would be terrified if my brother switched to a linux phone with his diabetes. There are just to many other issues ATM.