You don't have the knowledge or experience to do this for a business. This is different than a personal cloud. You will be blamed when things don't work.
Don't touch this with a 10ft pole.
If you want to help, find commercial services that offer this and suggest those.
I also would like to know what the desktop app is used for?
I've seen apps like xpipe that have direct Bitwarden integration if you want (way too high risk for me but I can see some people using it), but even then it integrates directly to the servers API. When I need an ssh password or something I copy and paste it from the browser extension. I'm curious if I'm missing some functionality by not using the app.