You also need to factor in the loss of wing efficiency due to having big gaping holes in the lifting surface. Those fan holes are going to act like big spoilers in a bad way in any sort of normal flying mode where there's a load on the wing. But if you did try it I'm sure it would be interesting. The odd thing is that you would have to use flat sectioned blades with no twist to them. As the rotation direction changes the blades would reverse their leading and trailing edges. Or I guess you could use variable pitch helicopter tail rotors and just move the pitch as required and run the motors all the time.