Re: Spur of the Moment Trip, Mt.-Id.-Wy. Tips needed...
I didn't realize that you are coming from Michigan. In that case why do you want to try to catch Lakers and Brookies in Montana? They are both abundant and native to Michigan and an invasive species in Montana - in the case of lake trout, which have devastated the cutthroat populations in Flathead and Yellowstone Lakes or sort of a waste of time to find in Montana as they are small and inhabit only the upper most reaches of streams. Unless of course you wanted to find some lake dwelling Brookies like at Georgetown Lake, where they grow to good size.
I think it's honorable to follow the laws in place and not "chumpish" in any way. Plus this time of the year you will no luck targeting Bull Trout anyway except maybe in some special spots.
Good luck on the Idaho advice. Have you considered Alberta, Canada?