What did you install on the RPi? Raspbian? Or OpenBSD?
Also, which VPS provider are you using right now? Which plan? How much
does it cost?
If you have some time... I would like to have some links from where
you learnt about bypassing the NAT :)
P.S. I had to ask.. did your bro checkout OpenBSD? What does he think
about OpenBSD (in comparison to Void)?
Have a good day