That's way too clunky for my tastes. It's doable, but I would never use it in anything big. There's just no way to apply it practically without being annoying/weird to players. Plus it's easy for something like that to go wrong. A "better" alternative would be to either make the levels really big so only 2 exits are ever needed (this would seriously limit the number of tilesets I want to use, probably cutting the amount by like 75%) or make it so a lot of the exits are "one way", such that a level may have three entrances but only two exits (this would be a very confusing layout for players and would inhibit exploration). None of these are good options though, which is why I'd simply just put aside the project if it had to come to that.