Yea I agree.
You are going to have to use AA plastic wads that fit the wall taper with AA hulls.
And since they don't make AA wads for 2" cases, well you get the picture.
I think if I was going to try it, I would use plain old tube & base-wad type hulls so you can at least use card & fiber wads.
Any type of one piece plastic shot-cup wad would take up way too much room in the case.
In all though, it sounds like a dangerous undertaking without tested pressure data, of which there is none that I know of.
And a normal shotgun reloader press will not load or crimp them, so you got to get past that somehow too..
rc