i put 3 seedlings in my flower room to sex for two nights, sure enough two females and a male show so i kill the male and put the two females back under 24 hour lighting in the veg tent (125w cfl) sure enough 3 months later they are still stuck between veg and flower, i had to put them under a 600 hps to get them to go back to veg.
without seeing the plants in person i can't say for sure but i have a feeling you will not be able to get them back in to veg mode without a very intense form of constant light.