I think it should be pointed out that unless the radio is upgraded from what comes with the RTF there is no lanyard ring on it. (Unless the radio has changed recently.) So unless you want him to hot glue one to the Tx that is not going to help.
I suppose a tray could be made to work but the bottom line is practise and experience. When I first started, I quivvered so badly even my lips were twitching. Did a simulator help? Maybe a little. Unfortunately I still new the difference when took off with a real plane.
Keep plugging the Cub is not a bad place to start you can beat it up and fix it with packing tape. It is too bad but I don't think that radio has buddy capability either.
Do yourself a favour find a club to get involved with. Having someone who knows what they are doing beside you helps a lot. I learned just by passing the radio back and forth between me and the instructor.
No matter what you decide......Good Luck and have Fun!!

Cheers

Gord