If it is working, perhaps you leave everything alone until you are next at the cabin. Then fiddle with your server while you have physical access. Perhaps we are pushing you to do something not immediately necessary.
VPN access is critical to me, so I am set up the same way as
@martinr. Except for power failures, the VPN server hasn't "failed". Sometimes I have done something that conflicts, or one or the other fails to start. The second server then has allowed me to revert the change, or at least keep going until I have physical access again.
If you start server2 while you are connected to server1, nothing happens to your server1 connection. If the server2 config is ok, you can go to the VPN page and see both running, with your active connection to server1. You can export the client2.ovpn connection while connected to server1. Have to, I guess.