How will the system know? Does it use encryption (I doubt it)....but I'm sure the licensing agreement of the software prohibits using them.
Which is why I'll gladly pay you $20 for that dead transponder sitting in your toolbox, and/or the number of that one you threw into the landfill a couple years ago...I'm sure you wrote that number down somewhere (like in your logbook), right...?And definitely no way you are going to upload data to mylaps with rogue transponder numbers.
GA