You could easily script something up to display your ap count at the start of each of your combat turns, and then each time your ap changes afterwards, while your ap+bonus move total was >= 10. It wouldn't really be the neatest solution though.
For changing the interface, recycling the bonus move image would probably be the simplest option that doesn't require any new frm's. (i.e. since it's a different colour, you could put one one at the start to represent 5 ap or something.) I'm not sure how much extra space you could make by moving the dots closer together, but that would probably be easier from an engine hacking perspective, albeit it would need frm edits.