Not sure what you mean not reachable LOL.
Remember you are putting all traffic out wg tunnel.
SO if you try and reach the router from your LANIP 192.168.10.XX its going out the tunnel if IP based.
MAC works around it and what most people use anyway.
If you want to retain IP access, then take a port off the bridge, give it an IP address only
and add the etheport to the LAN interface list and you will be able to access by IP address.
You could also create another VLAN to access it
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I dont see the problem, all your port forwardings from external users should come in the local WAN, hit the 192.168.100 or 101 and go back out the local WAN.
Isnt that what you wanted??? All other users are forced out wireguard for internet!