Nope read carefully..
Any user modification of a Transmitter that might affect the
transmitted signal is prohibited by law and safety concerns. This includes
user replacement of frequency determining plug-in crystals and use of
plug-in frequency modules from another manufacturer
It says modules from another manufacturer require realignment. We are just talking about replacing a Futaba FP-TF-AM with a Futaba FP-TF-FM..
That is allowed.
Now that does make me wonder how the 2.4g spektrum modules for JR and Futaba are allowed but thats getting off topic here.