I wouldn't think a deer is going to pay too much attention to your pile of crap. 100 yards is a pretty good piece. Rain is going to wash it away anyway. What about all the piles of coyote crap out there? Maybe you could take 2 scent-lock hats with you; 1 to crap in and 1 to cover it up.

PS: I can't believe someone hasn't posted the infamous Davidmil picture yet!