Can one hang a switch off the ethernet port of a complete WiFi disc to then attach ethernet devices?
e.g. router -> mesh to disc -> switch -> ethernet devices
Yes you can.
just bare in mind that it won’t be as reliable as wiring direct from the hub or another device that has a direct Ethernet (daisy chaining).
If the connection drops on the mesh disk then so will any Ethernet connected devices that are attached to the switch.