I'm not sure why you want to replicate the Group A pan. Why not just have them make a larger capacity alloy pan that uses the stock pickup, but has a great baffle system built into it? (Canton can make this up easy, they do it for other engine's all the time.)
Some minimum benefits of the pan should be 8 quarts at the "full" mark, meaning you can run 9+ with no windage issues.
A crank scraper built into the pan, or a screen type scraper that pulls oil off the rotating assy. and dumps it back into the pan.
All of that, using the stock pump and pickup would be possible, and should be 300ish stocked by Canton. (Or in a group buy setup at 300 and the MSRP being 350ish.)
Most people are not going to buy a pan unless they are building a motor, and Canton knows this. (And they stock popular pans for that very reason, or have the templates and jigs to make them in a short amount of time.)
I looked at adding kickouts to the stock pan, and I've seen it done a few times, but in the end, decided that the benefits of the accusump far outweigh the benefits of a few quarts of oil in the pan. (The group A pan is awesome, and if I had one I'd use it, but you can spend the 300+ better on a accusump and buying the best filters you can get from Canton.)
Just my .02, but keep in mind I have quite a few bucks tied up in oil mods on my car, and I'm running a stock pan..., but likely would have bought a larger capacity one AND run the accusump if it was only 350.00. (And I would have coated it too... LOL)