I believe you can get an RABC immediately "in hand" if you apply in person at International Falls or Grand Portage entries into Canada.  If you go through LaCroix the tow boat will stop at the Canadian customs for you, and you do not need the RABC if you do that.  
Have your buddy, if he goes along, bring his pain meds so he is not totally uncomfortable if his tendons flare up.
There are lots of beaver sticks or dead balsam in the woods to make a walking stick out of if needed.