Yeah you will definitely want to nuke pipewire 
I'm spitballing but I'd say you probably can do 96Khz given a lot of 7.1 systems are built for it and the Renoir HDMI or DP ports are probably assumed to plug into TV's with as well as normal monitors. The how well is the catch.
I'll try to toss in if I can with future questions but this stuff is tricky. Never mind with a card that isn't designed for low latency.
If you're going jack you can define your sample rate in the server line. You can do this to test and push the sample rate up, see if it works, kill, try next highest until you find your cards limits in supported freq/BR or just what is can process acceptably. I've sadly dealt with too many cards over the years that say ya ya I can TOTALLY do 32bit @ 192Khz...sure with a 5minute latency in the fine print.
/usr/bin/jackd -R -v -dalsa -dhw:UR-Interface-Here -r48000 <-- dat -r flag
Not sure if you have this covered yet but I also recommend linvst. GitHub - osxmidi/LinVst: Linux Windows vst wrapper/bridge It's what I use for my DAW. Simple to use, works well.