It's kind of a hassle to get there, but Ladyboot Bay on Lac La Croix requires NO portages.  You get there by driving to Crane Lake, then taking a powerboat "tow" (I've worked with Zups Outfitters out of Crane Lake) to Lac La Croix.  The outfitters stop and unload in Lac La Croix on a wee spit of rock, just off the mouth of Ladyboot Bay, which is just inside the BWCA.  You have a short paddle from the drop off point into the Bay..maybe a quarter mile.  You will find that others in Ladyboot Bay bring in lots of gear, on account there is no portaging...  I heard some outfitters even arrange to meet campers in Ladyboot Bay during mid-stay back out on this tiny island to re-supply them!   Ladyboot Bay is a beautiful bay and has pretty good fishing.

I don't know if this will meet your needs, but if you call Mark at Zups he'll be able to tell you.  

One potential problem....better check party size limit...not sure if it's 8 or 9, and I'd also check the canoe limit.  

Good luck!  

Another thought: contact Wilderness Inquiry in Minneapolis.  They are a non-profit dedicated to giving people with disabilities outdoor experiences.  They might have other ideas.  They are a very good outfit.  

prouboy