Why not just have a script that sets up all of the software one would want to host?

Nothing against this, but isn’t this basically Matrix?

I’m planning on using Vaultwarden as well. Does this work for Vaultwarden?

Nope, it doesn’t,

I’d like to have the applications running at the same time. This can’t be done with just 2 ports, can it?

This doesn’t show how to change those ports.

Or just don’t use Discord.