Here is a video of one guy who's using a Flysky radio with his Mac.
He's using a USB dongle, he mentions the specific model in the video.
www.youtube.com/watch?v=HIoECPKLJ-4
(vJoy and Smartpropoplus only works on Windows, not sure if there's an equivalent alternative on Mac).
Hopefully that will help, or if not I hope there is some Mac user on this forum who might chime in (I don't own a Mac myself).