Come to think of it, you might just be able to get away with "If a token would enter the battlefield under your control, you may instead put a card from outside the game that has the same abilities and properties..." OK, that'd be too confusing, but I think it might just work under the rules... :)

It still wouldn't be able to stop you from getting Emrakul from the sideboard to represent a 0/1 Eldrazi Spawn token, then using Cloudshift to bring its more natural stats back.

Ah, sorry I didn't see that interaction. The current version may be fair if this + token producer + emrakul + flicker is a combo -- a four card combo is generally ok. I meant that you could instead use a card that was the same as the token (eg. llanowar elves for the tokens from llanowar mentor, the same card if you make a token copy of something, etc), which wouldn't usually matter, but would fulfil the "tokens don't act as tokens" idea. Although I don't think my rules wording was quite right (is there no easy way to let grizzly bears substitute for an unnamed 2/2 token?)

Well, nobody has come out and said "that's a gross violation of the rules!", so I'm going to class that as a win :)