Also I just got a email back from Growers choice and I asked them about triggering flower with 12/12 and then switch back to 20/4 and this is what they said word for word...
Hello,
That is the correct method! You may increase your light cycle back to 20/4 once the plant has began to flower.
So I guess we will see what happens, I'll be the test dummy and run 12/12 then jump it back to 20/4