I'm currently doing an ATR type rating so just dealt with a flaps unlock after V1 in the sim today. (yes I know its not a full on retraction of the flaps) The procedure is to add 10kts to the Vr and V2 speeds.
Now if they unlocked and completely retracted I think you might end up rolling the thing up in a ball as you ran off the end of the runway. FWIW the flap zero Approach speed can be as high as 180 knots, with maximum tyre speed of 165 knots, so a simple add on of 10 knots to Vr and V2 probably won't give you flying speed..
Might ask the instructor tomorrow and try it in the sim.