Why not simply use another frequency for "training" fixes ? Great - and simple - idea.
But while we're at it, why not use another frequency for the airline jock who's spending ages moaning on the Tower frequency about his clearance, or his push-back, or his parking-position etc, when I'm on (by now) extremely bloody short finals and looking for clearance to land ?
Or how about one for the heavy driver who spent ages chatting to Stansted the other day about his crap day, the weather etc ? Good job no-one needed a LARS or anything ... oh, wait a minute, they did ...
Or ..... etc.
What ? You mean it's not true that "ATPL" stands for "All Transmissions Precise (and) Legal" ?
I'm in a state of shock ...
FF