A one time treatment with a 250 ppm foliar application during the second week of vegetation caused about 10% of a particular batch of new york diesel to exhibit early signs of flowering including the formation of very small white stigmas on one or two of the plants bud sites. The plants also became noticeably more odorous. This occurred under a 24/0 light cycle. After the above symptoms occured flowering did not progress any further. It has been reported that concentrations over 400ppm can promote the formation of male reproductive parts on female plants and concentrations of 1000ppms have been shown to promote the formation of female parts on male flowers.
It seems plausible to me that by applying giberellins via foliar spray to the plants on a daily, even weekly basis, the plant could be forced into flower under a vegetative light cycle. Only things to note would be 1) the plants would most likely gain a tolerance for the hormone and require an increasing amount every application. 2) your chance of causing a hermaphrodite to develope increase, though an observant grower might be able to counter this by dramatically increasing the concentration of giberrellins.
BTW it sounds like a really cool experiment. Being able to grow flowers with 24 hours of light sounds like huge bud to me, in addition juicing them with the GA3 would make Bud fit for king kongs bong.
If you don't stop at trying to flower with GA3 and try ripening with ethylene also, you might be able to go from veg to harvest in a couple weeks all on a high yielding veg light cycle. Food for thought.