I'm not sure one way or the other about this "huge" difference between f/w and rotary. Helicopters certainly take longer to learn in the early stages, but does this make any difference as to overload when using the radio?
Whirly, have I told you where my personal title originated?
I used introduced in stages to the radio (and I learnt at an international airport!). Firstly to request start, then maybe the downwind call in a circuit, then nearly all the circuit calls. But, just as I had nearly got the hang of a hover, (i.e. I could keep the aircraft in the grass circle about 10ft radius!), my intructor asked me to request right hand circuit northside. I couldn't speak. I pressed the button, I opened my mouth, no words came out! Actually one word did

.
So, I was introduced to it straight away pretty much. Also, my instructor would say, do the hovering bit to the hold and I would request the departure.
Cheers
Whirls