Hi @QubesUser32, welcome to the forum!
This sounds like a very specific setup. In order to make it easier for people to help you I would suggest you try to break it down into it’s various components and start a thread for each. That way people can contribute to them without having to track lots of parallel conversations and also because later those discussions may help people out.
And you’ll also see that some people already did part of your setup that may interest you. One particular example is Auto-mounting and decrypting disk on AppVM startup - #4 by jKER24qP (as you mentioned at the bottom of your post).
And then when you’re done with your full setup, you can use this thread to document what worked, what didn’t and in which threads those were solved. (But this is just an idea)