Hi,
http://openwisp.org/
For management OpenWRT wifi router/ap
Think with love about that ;D
How do you want to integrate it within OPN? Or do you just want to promote it :)
This cannot work with OPNsense because you cannot manage OPNsense with that.
Consider it as a competitive product for Access Points only.
OPNsense can also setup a captive portal, an access point, VPN and soon a plugin for RADIUS will come.
My idea is include OpenWISP like a service offer by OPN to manage OpenWRT routers and APs and not manage OPN with it.