A lot of "Stuff" on this post!
"V" foils lift the hydrofoiler's lee hull, allowing near vertical mast position. They probably won't go to weather well.

Canting an A-class mast is probably not necessary- they are awfully efficient the way they are today. And who is going to do it by hand? Glen Ashby? Naw.

T-foils are difficult to use to cause lift, needing flaps- hand held at the last best version. I went out last fall with my modern A-cat vs Doran Oster sailing his Rave with hand-held joysticks which did very well in their last National Championship: Fresh breeze- 13-16 mph. I ran all over the Rave while it was reaching on foils. And Raves don't go to weather on foils either. Then I put Rave T-foils on my wooden A-cat- and found the vehicle heavy, but it did come out of the water.

External carbon foils? Interesting idea. You have just described a Palatka-Jacksonville Mug Race boat!
Or Randy Smyth's 2-year old Scissors trimaran built on an 20 foot A-cat hull- that is faster than a Tornado.