That's how you do it,you got a late start on it,but it should work fine.
I considered it late when I started LSTat 8" tall on a little lowryder I just harvested,so you'll get the benefits of lst,but your plant will just end up a bit taller than if you'd started it at 4" tall or so...
I'm growing in BlackMagic potting soil (home depot)-that shiny stuff on top of
the soil was an attempt at slowing down evaporation to lower the RH in my grow box...It helped a little for that,but it also supplied the soil gnats with a nice damp place to breed,so it was pretty much a fail.
Oh dang that sucks. It crazy how cheap it was. In my grow tent it’s pretty weird, everywhere it says how hot it’s gonna get. But instead the temp has been going down cause of it