so he could just wait in the dressing rooms and all reserves could take a 10 second detour to get the information from him.
Can reserves talk to the crowd during and after warmups? Can they talk to someone who is on a phone call to a coach in the coaches box?
I think for every reason why the coach cant be on the field there is a way to achieve the same result, so just let it be
College Football in the states uses big cards on the sideline to send out plays (I seem to recall the Raiders in NRL doing the same)
http://sports.espn.go.com/espn/page2/story?page=hruby/110107_oregon_ducks_signs&sportCat=ncf
each box represents a possible play, some teams just use different colored pieces of cardboard.
The Reds could simply use a picture of Van up when it is time to roll some c#*t