Hey I don't know your technical capability, but Steve Gibson pointed out the lowest knowledge way to get an isolated network just by buying two more cheap NAT routers. Your current router stays routing internet, but in LAN1 you plug in one of the new routers, let's call it your home network, and LAN2 of your internet router plug in the other router and call it insecure. Plug in your WiFi access points into home and your devices. Plug in work laptop and other IoT to insecure. Home won't be able to talk to insecure, and insecure can't talk to home. This is all because of NAT. Just make sure the home network range is a different range to the insecure.
Otherwise it's just a vlan on router and switches and access points with no firewall rules that allow INSECURE to HOME.
You might already know all this in which case never mind!
Good post, nothing else I have to add though.