I use airvpn with an always on server setup, port forwarding, and constant seeding. If you’re okay with manually using a wireguard or openvpn client instead of an airvpn specific client it works great.

Edit Plus, they have a progressive pricing thing that lets you buy a few days for like 2€ just to test stuff.

Eh, I sometimes spin up a temporary docker container for some nonsense on a separate computer. I usually just go for it after checking no one is on and backing up necessary data.