I would consider using cheap Orange receivers a risky decision to take as well, especially with larger models.
Apparently, it is alright to make equipment that can listen to a particular protocol but not transmit them. There is an transmitter module by Orange as well that will make Turnigy 9 transmitters compatible with Spektrum. There is a similar Spektrum module for Walkera and transmitters of other brands using the trainer port.
In the below video, you can see the module being set up for a Walkera 2801 pro followed by a Futaba T8FG transmitter