http://www.geocities.com/shtinkythefish/pfish
http://www.aquariacentral.com/fishinfo/fresh/paradise.htm
There are a couple of links for ya. And have you heard of fish having their growth stunted? Well do a little research on that before figuring that you can wait until your paradise outgrows your small bowl.
My experience with small unheated and unfiltered bowls is that they fail and at best produce listless and boring fish.
But seriously the best answer for you at this point is "Thank you for the information" and then move on because as Roan said you will do what you want anyway. No one on this board will give you the thumbs up on keeping 2 paradise in a 2 gallon bowl with such huge temp fluctuations. That is jsut the way it is. You can try searching other boards, maybe some one will argree out there. But if you don't agree and don't want what seems to be a lecture then just say thanks and that it.