I have the original typical FC tray, so yes, your idea was my plan B. As I have a 3d printer, if I can make a nice, clean solution with a custom made case, perfect. if not I will just place the electronics inside the module space, or inside the transmitter....
Fortunately, TG module comes with a 20cm antenna cable, so I have no trouble. Other jeti modules come with the antenna directly to the the module. Antenna will be placed on one of the free switches holes
I have to say that I have a true jeti DC16 radio, so the idea of playing around with the FC28 is because I had no use for it, and because I had the chance of paying 20 bucks for the module. Has it been higher the price, I would have not bothered. I can use it as a radio for my kids, or maybe it can be connected wirelessly to the DC16 as a student-teacher setup.
Will let you know
Paco