Hadn’t heard about deSec until now, seems to be run by some cool privacy minded folks in Germany:

https://desec.io/

I guess you already know about the options, but for others:

Find the cheapest VPS out there and have a Wireguard tunnel between it and your home network. Run ddclient or similar on the VPS in case the public IP changes.

For the same price and power usage as the Pi?