I applaud your innovation. Every finger stuck in the dictator's eye is good to go with me.I'll create it, and bring it for approval by the NYSP or whom ever is saying what is good or not. Can't hurt to try right? Maybe i'm not the next million dollar idea.
Or get arrested and prove in court it is legal. however, that isn't an option for most of us.Its a pistol grip with a stock attached to the bottom.....if some one feels like arresting you.
There currently no way to have something determined legal or illegal.
the best you can get right now is a verbal from the NYSP