let us know how it turns out, I would second the above comments but a good DWR should help for a little bit.
Personally, I'd be worried about the Frogs Togs wearing out from use at seams or from the weight and rubbing between your shoulders and pack straps and then the whole garment being to expensive to replace because of the added features/shell - which I'm not convinced there would be enough increased durability, from wear from just moving in the suit, to offset the added costs.
I also wonder if with the total weight-durability-and replacement cost, inexpensive PacLite or eVent may not end up being overall the better choice.
Still, let us know how it goes, I'd love to find out. And it would be cool if it worked out well.