See their website.

This is hitec:



and this is JR:



If you have a mono plug, just make yourselve a Y-connector. Just a five minutes soldering job. I think this is covered by their product policy as I can read:

"My courtesy: I replace EVERY defective interface free of charge. The chances of a factory broken interface are very low but the CAN HAPPEN. If this happens, it is my duty to replace it free of charge. Please send in your defective interface - it will be replaced*. I don't care about the reasons. If you are resoldering the plug to make it suitable for your radio and it doesn't work afterwards - no problem, as above. If you are crossing the interface with your chair - as above. If your dog/crocodile had eaten it - as above but please clean it before shipping."

and

"Special Adapters needed: As the radio manufacturers love to have their own student or DSC socket, it is quite complicated to keep track. Reflex comes with a selection of the most popular adaptors** but we can't cover ALL the radios available for reasons of costs. The normal modeller can solve 95% of the tasks using a soldering iron. In case special plugs are required, you may ask your radio vendor for adaptors. In most cases we can help at minor cost."

So I guess they don't object.

The stress you read about normally refers to the confusion on the DACH (Germany/Austria, Switzerland) markets, as here we have Graupner solutions to confuse us. Once you soldered your connector, make sure your radio is turned OFF when plugging in. Otherwise the radio will start in teacher mode, emitting no signals. See your radio manual at page G13 and A44/45