Several viable boat options are available. However, since it is a long drive to the Breaks, another 2-3.weeks would be added to fly fish some MT and WY waters. The dual purpose skews the boat selection.
First choice would be a Mini Mac 12 drift boat. Easily holds all gear and a cooler. This boat is the worse tracker of the three due to lack of keel and bottom rocker. Great for maneuvering in rivers.
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The next two choices would be canoe with rowing modification or sea kayak.
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The canoe would be second choice since it holds a cooler. Both offer much less windage. The canoe offers options to shift my butt around while I would have to complete several consecutive days in kayak before confirming my body would conform to extensive seating.
The drift boat weighs about 150 pounds, canoe about 70, and kayak around 45.
It also makes it easy to invite friends.
Ants
I'd like to hear and see more about your canoe with rowing modifications!