Bridging wg and normal interfaces?

[Jason A. Donenfeld]

WireGuard is layer 3, not layer 2, so bridging is not what you want.

Instead, do ordinary IP routing between different subnets. As you
appear to already have different subnets, this shouldn't be a problem.

If you'd like to overlap within the same subnet, there's always proxy
arp, but I'd caution against that approach.

Lots of people run into this confusion about layer 2 vs layer 3. We
can probably walk you through getting things rolling for your
particular setup in #wireguard on Freenode, if you have IRC.

Jason