Raspberry Pi:

1. Install wireguard (as a server)
2. Set up a peer/client config
3. Open wireguard port on the router

MiniPC:

1. Install wireguard (as a client)
2. Add server config and connect to server
3. Verify connection
4. Ensure connect on boot

Points to note:

• Configure them both locally and ensure you have a connection before you move the pi to another country

• If you’re behind a CGNAT on one network, that’ll change some things. That network will have to be the client. (If both are behind CGNAT, you’re out of luck and cant use this - will have to be tailscale or other method)

• If using a domain name make sure its always pointing to your ip (in case it’s not static)

• I think if you set allowed ip as 0.0.0.0/0 on the client it’ll route all traffic.

Edit:

Saw your comment about just having qbt use the vpn. Check this guide out