I think you should give it a go on a couple of the sativas. They’re a little longer flowering right?
It’s not going to hurt anything. Just grab a couple and give them 10-14 days to root, throw them in a pot and let them go. Sure, they won’t yield as much as the others with veg time on them, and they’ll finish a little behind. But it would all be bonus weed right?
You’re biased I’m sure of it lol. But I’m also fairly certain that those plants should grow healthy a little easier under that type of light spectrum than a blurple. I wouldn’t be surprised if they eat a little more though, so be vigilant.
As far as height, you’re asking how tall to let them go before flipping?