I don't think that the implementation in this case is relevant. The underlying idea is fairly similar as far as this use case goes. And while your method works

I don't think that the implementation in this case is relevant. The underlying idea is fairly similar as far as this use case goes. And while your method works, I think it's also more manual and involved than a simple VPN setup. At the minimum, you just set it up, connect all your devices to the server and write down the IPs.