I personally could see that working. Look at how Disneyland worked Indy into their Adventureland area...with a very long yet cool queue. As for the parade float road...well, there's always the possibility of either building a bridge going over it or a tunnel under it. Disney has built around many obstacles in years past, and I really don't see this as a big obstacle they couldn't get around. I would love to see AC make it's way into AL too...but I would place it at the entrance of the land replacing the now defunct old restaurant they had there.
What restaurant was that? I know that disney co has the no alcohol rule for their mk parks, secluding it away would limit alcoholic sales into later in the day.