The help screen for SkyCAT shows --list as an instruction to list available radio models.
When I try to use the function, it throws an error about not being able to start the server due to lack of instructions for a radio with the ID of 0.
So, evidently to find out what the correct model designation is for my radio (using the one that is the name of the relevant .json file does not work), I need to enter the model designation of my radio.
The Github manual says to use the same instructions as I would use for rigctrld. I do not use that or have it on my computer.