This is possible with sr-iov (Single Root I/O Virtualization) but it basically only exists on enterprise hardware and you can "hack" it for 20xx series and earlier so it could be a valid option if the performance of only using a 2080 is okay
Couldn't you just treat the socketed ram like another layer of memory effectively meaning that L1-3 are on the CPU "L4" would be soldered RAM and then L5 would be extra socketed RAM? Alternatively couldn't you just treat it like really fast swap?
As someone in a similar situation I'd recommend using a free tier oracle vps with a wireguard tunnel to connect to you services. Effectively just using the vps as a proxy for your own network. Here's a guide that should work for your purposes https://github.com/mochman/Bypass_CGNAT
I just want to laugh at the first source being a WordPress page that's pro al-assad which really just screams super trustworthy to me personally