@Kos-Mos: Yes, 1 micro swithc+1 selector swich(middle position=safe)...
But as I remember V7's semi auto works half 'mechanically'. So I think it can't bypass so easy...
I have an AEG wizard, and planed it so:

If it won't work; I have to do this:

So mates; what do you think? Does the first plan works... or not???