I agree with the advice you have been given and I would take a comfortable pair of rubber and a light pair of hiking. Foot wear is not where you should be trying to save bush plane room/weight on. I have used the L.L. Bean type boot too.
Weather will probably be variable but on the wet side. Depending on where you will be, the terrain will most likely be variable too - rocky, soft, mossy, brushy, (but also on the wet side).
I guided for about 18 seasons up there and live in the caribou southern wintering range (southwest of the fall hunting area).