Just an idea: why not put "slits" or even slice into the butt (and I mean fairly deep), insert the bacon and if needed, tie up with butcher string then smoke it?
I know when I put a prime roast just in the regular oven, I put half a dozen slits in the meat and insert 1/8" slivers of garlic in for flavouring.
The same should work for butt and it won't interfere with the bark.