So long as you have a light to interrupt the dark cycle, you can put clones outdoors at any time.
My clones came from 18/6 veg room; putting them outside now they would certainly flower and reveg.
I simply put them close to my porch light, turn the porch light on for a couple of hours in the middle of the night, and zero issues. Keep interrupting the dark cycle with your florescent light, eventually the plants will get the hint and you can forgo the light.
Unfortunately, since you already triggered flower, they will guaranteed reveg unless you get them under a light-dep hoop house. Build a hoop house and cover it with pitch black tarp/visqueen and replicate the 12/12 cycle. Unfortunately, if those plants are left outside, you'll see them start to reveg within a month.
Your only options with those plants are to bring them indoors under 12/12, or light dep outdoors.
All the best.