[e12e]

I use zerotier[1] in a similar fashion, and I don't think there's any out of box solution to get wireguard to do "smart" routing (have two hosts on same switch talk directly, still be able to talk to server in a remote datacenter and a client roaming on cellular - with multicast and mDNS/bonjour working seamlessly).

It should be possible to set something up - but I believe you'd need some kind of managing daemon that helped nodes rendevouz and set up routes.

[1] https://www.zerotier.com

[Daegalus]

I use zerotier in a similar fashion. It has been great.