Yeah the new VM should just draw from your remaining RAM. My Debian VM is only using a few GB (6? 8?) but my Dell (I have a 7050 so it can’t be so different from yours) still has 10gb to play with.
As for the running out of USBs I guess you could run a usb hub to one of the usb ports and just pass through the one, although I don’t know if that would break something.
I don’t think they do a powered usb c to sata but I could be wrong. I’ve used 3/4 of the ports on the back for HDDs, and the remaining one for my ZigBee stick for Home Assistant VM and have one spare (on the front) plus the usb C. I have passed that usb C through to a VM for a usb c to 3.5mm (to send music to speakers) in the past though.
You could try a usb to sata (powered) and a usb c to usb a to plug in to the usb C socket I guess, try that? I have a few usbc-a adapters knocking around the house so if you’re the same you could try it for nothing
My problem with this solution was that I have signed in to Tailscale via my Google account, and I have to buy Mullvad through Tailscale, linking my Google account to the Mullvad account.
What I wanted to do was have my own Mullvad account and route Tailscale through it, but that wasn’t possible, I had to have Tailscale manage Mullvad, which just didn’t sit right with me.