Dr A you're getting some good solid advice here
I could not agree more.
the Futaba 6EX you mentioned is a decent radio, BUT I agree with Rougedog to go slightly bigger if you can. (even a tactic ttx650.. very nice entry level computer radio)
My dad (age 93!) has three 6 EX'es, although they work FINE, they do leave room for improvement... (for example, there isn't an easy built in method of using dual elevators or for using elevons)
doable, yes just not quickly and easily.
you're going to LOVE that Dirty Birdy!