Depending on your crew's ability to portage, you may be able to make a few portages, especially the well-worn, flatter ones.  I've had guide friends take similar groups up to Knife Lake and Ottertrack along the border, if you can manage a few shorter portages.  There's lots of paddling that can be done with only 1 day of portaging.  A wheelchair may not be easy, but I know they can be done, especially if you have a couple people assisting him in the tough spots.

However, if that's not your cup of tea, I'd say Basswood will be your best bet.