Yopu are basically proposing a short refi and there are companies out there that could assist you. My guess is that you have the liquid assets to pay it off, this will be a tough if not impossible road. IMHO, The only way they do this is if they believe you will walk away. The only way to pull this off IMO would be to come up with a compelling story as to why you are walking away and then do a short sale to someone you know or trust. Might want to consult an attorney before doing this…….