What if you girdled the main branches, or even the whole plant, just above the soil line. A few weeks before harvest. As in, cutting\peeling away the outer bark layers, all the way around, but leaving the inner xylem intact, so it can still transport water up to the buds. If i remember right, it is the outer layers of a branch that transport most of the other elements and whatnot.
After all, many of us agree plants don't flush anything out, so what would cutting off the skin a few weeks early harm?
Like taking an air layer clone, but not actually waiting for roots, because you will be harvesting those branches in a few weeks instead..
I've never attempted to clone a ripe branch with full on colas that way, but i'm thinking it might be another way to force extreme fade towards the tail end of a grow, and without completely locking out the roots via PH levels...
Kind of like that cola branch you accidentally break sometimes, but you leave it dangling there, and it starts fading fast as it dies off. Then you get some good early sample product to test out.
I'll try it on the next run, on a few sections.