No you wouldn't have the same in floater mode, the foils would be inboard(can't go outboard because of max beam rule) of your hulls, instead of through them, unless I'm misunderstanding your concept.This puts them 8-10" inboard (each hull)of where they generally are now, making a decrease of 16-20" of righting moment.
Perhaps the A cat Foiling Rules need to change too. Make it easier to control, via the wand system, make the foils easier/cheaper to build and install, and they will get more boats foiling, faster, safer, cheaper. What's not to like? I mean, if you are going to toss the non-foiling rules, and go with foiling, why not do it right? The Moth guys figured it out a long time ago with the wand system.
Go look at that S9 video Mike posted in the other thread. Do that with the A cats and presto, full foiling class that could also be converted to non-foiling, or allow all the (old, obsolete) A cats to install that type of foil system and be competitive again.
