I've seen quite a few try this approach and it never goes well.
Maybe should be an override whereby the 'Head Coach' will sign a punter and a kicker if none in the game day 46 and cut a player if necessary. Get them in on a one year basic contract with no bonus and autoplace them at #1 on depth chart for FG, Kickoffs and Punts.
It's generally a rookie error, obviously if a punter/kicker is deactivated, the initial override, would be to put him back in an deactivate another player (maybe lowest rated, with three or more players listed at a particular spot.