It would be cool if it could somehow integrate to a VPN and only do that while the VPN is active. I don’t think it’s possible, though

A split-tunnel VPN could do this, but it would require some advanced routing and awareness by the plugin to send the request down the other route. I think that would mean the plugin would have to have deeper hooks into OS to reach the IP stack which browsers usually don’t have, so there would be some security implications there for abuse/attack surface of the plugin.