You'd have to have a POD well before the Tea Party then, it was New England that started the Revolution... you'd have to have a POD during the French and Indian Wars I suppose. One possibility- the French survive in Canada but not in the Ohio Valley, meaning New England is still threatened but PA, VA, and the rest of the south can harbor resentment to the British for having to paying taxes to defend New England from the French in Canada, the South and Mid-Atlantic states have western territories they want to settle but the British won't let them; meanwhile New England, with no western territory that is practical to them and a French threat to the north provoking natives. That leaves New England wanting to remain British for the protection and the south wanting independence in order to move west and get away from what is in their mind the parasitic New Englanders. PA goes for independence, NY could go either way, but with a sizeable loyalist population and as we know from OTL a harbor conducive to the British sea power and hardly defensible by the Americans, the City of New York goes British and by default perhaps the whole Hudson Valley when it comes to the peace treaty. Perhaps the British give up Bermuda, or screw the Spanish and give East Florida, in return for keeping the entire Province of NY.
Interesting side-idea is this- if the war is limited mostly to New England, perhaps they conquer New Brunswick, maybe even Nova Scotia.