Haven't had to use port forwarding for gaming in like 30 or so years, so I just looked up Nintendo's website...
Within the port range, enter the starting port and the ending port to forward. For the Nintendo Switch console, this is port 1024 through 65535
LMAO, no thanks, that's not happening.
For your question, you could likely route everything through a tunnel and manage the port forwarding on the other end of the tunnel.
Oof, I remember going to people's homes to install phone and Internet links using paper maps because we didn't have maps on our phones back then and the GPS were mostly shit and out of date.
Some of the smaller villages were barely there on the regional maps, aside from maybe a dot near a main road with none of their actual streets.
For these, we'd call or stop by city hall, sometimes they'd have a shitty map or just directions.
I'm getting old...