Why don't you work with the seller and arrange a short term lease, with an option to purchase. This is a viable solution to your problem. You should have someone negotiating on your behalf so that you get the best deal, but this seems like a triple win. You get to live in the home, you pay a lease rate that might be similar to your new payment (or maybe less), and you get the house you want.
If the owner's can't move out, you could still structure a deal that is an future date purchase. You can structure this pretty easily too.