Wired ethernet bridge to guest network?

I have two routers running FreshTomato 2020.5. The main one is 192.168.1.1. The secondary one is on the other side of the house and is bridged to the first; it has an IP of 192.1.2, has DHCP disabled, has 192.168.1.1 for the default gateway, and has wifi configured as an access point with the same SSID and WPA2 credentials as the main router. The two routers are connected with CAT6, each to a LAN port (secondary router has nothing connected to the WAN port). This all works fine; I can...

Wired ethernet bridge to guest network?