I thought about that, but that's not very practical.
I have the same issue with a printer that is "cable" connected so it's not in the WIFI. I want to restrict it's access in the network as much as possible.
I am wondering how can I restrict the access of some Wifi Devices in the network.
For example: printers, smart-plugs,TVs... should have access to the internet and maybe to some "whitelisted" IPs within the network but that's it. They should be somehow restricted from the rest of the network...