[DouglasCole]

I will take on some alternate movement AP cost concept on my blog either this week or next.

My suggestion is to go simpler. Change the costs for movement to just be lower. Say, 1 AP to move up to half move, 2 AP for up to full move.

I will pose some variants, but for what you're looking for, lowering or eliminating cost for move will be a lot easier and can be dropped into an existing game.