Not gonna lie microg is not that bad, as everything as it's downsides, in my experience, indeed I'm writing this comment with a phone that has lineageos and microg installed.
Thing like gps are not the best not the worst either, bur every app I use work without any problem! And in the list there is even the app for my credit card.
Yo dude I have a soundblasterx g6 too, I had this problem too where the sound card disconnected and reconnected as an output devices everytime, I have resolved the problem by changing this setting in the soundblaster commander under windows.
There is no equivalent driver for linux, at least for what I know, but I'm trying my best to resolve the issue by reverse engineering it.
For the mic problem I use a bash script on startup that change the mic to the one of the sound card.