Push come to shove, handling the snake is not a top priority, but I won't get the snake if I can't care for it properly... there MUST be an Arboreal dwelling snake that's in the "beginner" section.
Well if that's true then it doesn't really matter if it's a begginner species or not if you're sure you can provide the correct environment. You sound like you've done alot of research so that should be no problem, personally I like snakes I can handle. If your looking for a snake to be more of a display theme then almost any aboreal snake will be fine provided with proper climate and sufficient hides.
Might not help any, but just my 2 cents.