funny you mention this, I took a clone from a plant in flower for under 2 weeks. After clipped, dipped and rooted it a shot out pistils on the top. Fuckin wierd, i will try to find the pic for you asap, but it rooted fine.
That will be difficult. It takes LOTS of time for them to revert. I pulled mine at 2 to 2.5 weeks into flower and they rooted in a about 2 weeks and then had 2-3 more of veg time. They had slow growth right up until this last week before going to flower. Now in flower they are taking off quite well. A benefit is that they shot out into a bunch of tops... almost as if they were fimmed.
I took 4 clones from a plant that was 4.5 weeks into flower, I really wanted the strain (White Rhino) and I wanted to try to see if I could. I took it as any normal clone and 2 made it. They bush out crazy off the bud when it starts going, I did take almost twice as long as normal clones do to root.