I imagine they would be allowed to train with the club.If we get to play a side with a top up player on the field we should have a good time, if there are five or six we should expect to score almost every time we move the ball from defensive fifty forward.
Have you ever seen the team drills come to a halt and the coach blows his lid over someone being in the wrong place? Lyon used to do this quite a bit. That will happen on a far more costly scale all the time during a game, especially if the wingers or half forwards are sidelined and replaced with freshies.
Short of the opposition fielding Phil Inns as key backs or tagging defensive mids, who will has simple instructions to stick to their opponent all game, the rest of the structure will be loose like a sales pitch for tupperware four drinks later than planned.
Don't we already have 4 Peel dudes at the club (Roy George was one from memory)? Eagles have 4 train on players as well. (Nads is one I believe)
Logistically, it's pretty difficult but not impossible.