For ease of keeping it simple you could of accomplish the same network for your wireless and wired by just using your old wifi route as AP and connecting it to your wired network.
You turn of the soho routers dhcp server, you give it a IP on your network for its lan. And then connect it to your network via a lan port on it vs its wan. There you go 30 second AP.. That sure and the hell is much easier than creating a bridge..
There are no routing rules if you just put the pfsense wifi on its own segment - firewall rules yes.. But if you make the them any any you pretty much have 1 network with just broadcasts not passing between them.
As to getting a home budget AP, I would look towards the unifi stuff.. https://www.ubnt.com/unifi/unifi-ap-ac-lite/
You can have as many WAN connections you want, that has nothing to do with number of local network segments you run or don't run.