Some thoughts:-
1) Mostly, any Germans working with Indians will be jaeger or other light infantry, because of the nature of how Indians were employed. Oriskany has been mentioned, although there is no record of the Hesse Hanau jaeger at the siege of Ft Stanwix becoming involved in that action - just Iroquois and Loyalists. Bennington is an obvious example, but there were some Indian and Loyalist scouts at Hubbardton, too. The Main theatre is pretty much dead ground, as the NYC and Philly campaigns did not involve the employment of Indians by the Crown forces.
2) Look up an author called Gavin K Watt, who has specialised in the lesser-known raids and campaigns in the Northern theatre, and he covers the whole of the war in the north bar the actual Saratoga campaign (which gets plenty from other authors). His book "The Burning of the Valleys" is an excellent tome, with several scenario ideas involving Indians, Loyalist rangers, British light companies, and the Hesse Hanau jaeger battalion (at the same time, leave the two books by Mike Logusz well alone - they are littered with inaccuracies and weirdness, and that's before you get to his obsession with tomahawks).
3) Don't forget that a few Indians fought for the Rebels as well - chiefly Oneida and Stockbridge - so they don't have to be on the same side. Ewald in his "Diary of the American War" actually includes a description of them (on which the Perrys based their Stockbridge figures), as they were part of a Partisan legion (MacLane's) against which Ewald's men fought. Here's some details of a battle they fought in:-
http://www.americanrevolution.org/ind3.php4) You are right that the Southern Indians would have dressed very differently from those in the North; that said, there were several actions around Pensacola that might fit your requirements. An American author named Bruce Burgoyne, who specialises in the German forces that fought in America, produced a book on the Waldeckers - there are no maps, unfortunately, but he does quote participants regarding some skirmishes.