split-vpn VS udm-patches

With Router side VPN it shows up in the DPI.

yes i as well think this is sad that such things are not passible "easy" through the frontend. you can look at https://github.com/peacey/split-vpn to see if you can get such working but its then not an out of the box solution again.

Honestly just use this, it works wonderfully with wireguard vpn providers and you can assign a specific subnet, VLAN, or interface to the VPN tunnel.

This is what I use. I have a wifi and connected to a separate vlan that routes through my openvpn connection provided by expressvpn. Any device connected to that wifi goes through the VPN connection. https://github.com/peacey/split-vpn

I use wireguard on the UDM Pro unofficially to route as a client, and here's some extensive performance testing I did. Typically, the UDMP/SE is perfectly able to saturate a 1 Gbps connection up and down through wireguard.

I have successfully configured this script to connect site-to-site with my family home. There is only OpenWRT router so I can use OpenVPN only.

Alternatively, there is another script another user made here that I found. It claims to allow you to have a custom OpenVPN config while keeping it integrated via the Unifi interface. Not sure if that means you can debug it through the interface, but you might want to check that out too if you prefer not to use the command line to manage the interface. I can't vouch for it as I haven't tested it myself.