I've got to wonder why the A cats haven't done the tilting mast thing yet. As you say, it would be easy to do with a simple block system on each side stay, like an adjustable trap, as long as you put a stopper ball at the end to keep it from going too far out, probably that split forestay would also need to be adjusted? But you could also lead those back to the main beam through blocks, so maybe their rules prevent it?

Dave has already done a foiling A cat, but now with all the carbon stuff, it could probably be done lighter, and faster, but way more expensive, no doubt. And, would it work on the present courses we sail? Would a foiling A cat point upwind as well as a regular A cat? How well do the Moths point? I've never seen one except on You Tube and that wasn't racing upwind.