Increased Vr is a suplementary procedure specifically related to windshear mitigation, and you do NOT increase the V2 as part of it.
My comments are generic.
(a) nil windshear, as it turns out, if you increase VR then, OEI, you will end up with a higher than scheduled V2 .. the two being tied up with the rotation rate. AEO, you will end up with a modestly significant increment above V2 anyway. Mutt's comment probably could have been clarified ..
(b) if you actually end up in a significant windshear situation, then V2 becomes a bit irrelevant ..
(i) OEI ... shouldn't have got out of bed that day. Crash, burn, die in all likelihood.
(ii) AEO ... you'll be going for the feathers or whatever is equivalent on your particular machine. V2 is of no interest at the time and has no relevance to survival.