Can I go back to veg after just changing to flowering lighting schedule?

Two days ago i changed to a 12/12 lighting schedule , I haven't changed the nutes over yet and it has vegged for a little under 2 months and I think i should have vegged a little bit more but it was getting pretty tall but now after i have trimmed there is enough space to move them around and flatten it a bit but i want to develop some of the weaker looking stuff on the sides. Will this work if i change to 24/0 or will it mess with the plant too much? If i cant go back to flower it wouldn't be the end of the world still got plenty of good bud sites
 
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