I am looking for some advice on how to (if possible) setup a wireguard network for my home network and when I am connected to that network have a remote wireguard server act as an exit node, so that all external traffic appears to be coming from that remote server whilst keeping traffic bound for the home network local (only accessible via wireguard network)
Local server is a Debian box and other devices will run a flavour of linux. Remote server is already running wireguard and I can connect to that if I bring up a route on each device, but ideally I want to connect to my home net and automatically have outbound traffic go via the remote server. The remote server’s wireguard config is not under my control, which may make this unfeasible
If I’m understanding what you want to do, I have this set up on an OpenWRT router with multiple remote endpoints used for different devices. Our phones go to a hosted Wireguard server in one city, PCs to an OpenWRT router in a different location, and IOT devices that aren’t blocked and guest devices exit access the Internet locally. With some additional work you should also be able to have remote devices connected via WG exit wherever you like.
Policy Based Routing on OpenWRT makes this possible and it should be doable as long as the devices you want to allow to exit the remote server are included in that server’s “Allowed IPs” setting. (Maybe there’s a way around that, but I haven’t had to deal with it.)