Hi daniel,
I use Voicemeter Banana (and now Voicemeter Potato) with Teamspeak and the Desktop App for precisly that reason - Discord is a PITA!
I don’t crash at all, I’ve got a separate channel for my voice and for Syrinscape (& other) sounds, the quality is great, and Teamspeak handles it all - no fuss, no bother. And for the record I’ve got playes across the USA, Tialand, Irland, Japan, and Australia.
Seriously, there’s no reason what-so-ever to avoid the Syrinscape Desktop App because that’s not your problem - at least, as far as my own experience is concerned its Discord which is the problem in your set-up.