This holster issue is much like the old saying about pornography, I can't describe it, but I know it when I see it.
There is no approved holster list. I think most of the BOD were just praying on common sense prevailing. If you are using a LimCat or Ghost holster as your Production Division rig, you probably have a problem. I think, my opinion, if it is a BladeTec it is probably OK regardless of the cut.
Unfortunately this is going to be a case by case issue. But if you are meeting the spirit of the rule, I don't think you will have a problem.
If in doubt, take a picture, and e-mail it to NROI and have them look at it.
If it doesn't look like a race duck, walk like a race duck, quack like a race duck, it is probably a Production duck
Your mileage may vary.