One more possibility is you can post your save game here or on those forums (use an upload host like mediafire) and ask someone to beat that part of the game for you. Hopefully someone help you out then upload a save game after that part is beaten, allowing you to continue.
If you are fully up to date, mod free and, have the Deluxe edition, I promise you, I can get you out of there the victor, no matter your party. (I also take down the Hinterlands Dragon at level 5-6 on nightmare so, yeah I think I can manage it.)
And no I'm not bragging, just an old fart that has been playing combat RPG games since before there was such a thing as the internet - you learn a thing or two in all that time, and some things never change, you just have to apply them to the next game.
