So today I installed openwrt on my Asus AC-3100, configured it to behave as a "dumb access point" and finally managed to get wireguard to run.

It does work well, but it wasn't straightforward to configure all of these things properly through the UI.

In particular, I had to figure out the hard way that one needs to add

    option route_allowed_ips '1'

to the wireguard config in file /etc/config/network

(this option doesn't seem accessible via the UI)

There also seems to be a couple of very wonky things around static route management and also the 5GHz radio band that stubbornly refuses to move where I want it to be, but otherwise it works really well.

I'm going to play with it for a month and drop dd-wrt altogether if I don't encounter major problems.

https://gist.github.com/Snuupy/543baed996a01506499bcc59398da... you might find this helpful (some menu buttons might be outdated since the last time I did this was on 19.07.3)