Would it be an issue with 2200 metres, what is max flex allowed on that frame with those engines?
Sorry, the question has no meaning. Max flex at what weight, what OAT, what QNH, what wind, wet or dry runway?
How often do you find V1 = Vr?
I don't fly the little bus, but FWIW, V1 on the bigger ones is often the same as Vr, or within a knot or two.
The point remains that if you're using a flex temp with a small margin, you're in strife if you lose an engine at or near V1 and the runway turns out to be 400m shorter than you thought it was.