I understand that WiFi range extenders (currently) cannot extend Guest and IoT WiFi networks available on modern Routers (e.g. AX55) due to some lack of hidden SSID capability.

PowerLine Range extenders function differently and are not using a hidden SSID to connect to the router that should not be a problem with htese extenders.

Reuqest is to replicate all WiFi networks including Guest and IoT via OneMesh/EasyMesh at least through the PowerLine range extenders (ideally also WiFi range extenders).