Good product and I can't recommend anything better, given that you're late in flower. IMO, if I see new pistils popping out like that, the girl isn't done in my book. She may have more stack in her yet, no?
How about, instead of flushing as I think you're describing, you just give either water only, or very, very diluted feed?
Have you tried it yourself, though? I use it regularly and it doesn't harm the trichomes that I've been able to see. It evaporates very quickly, leaving zero residue, which is part of the goal here. I mean, maybe if you really go to town using indiluted iso and just keep saturating and saturating and saturating the plant you'll 'harm' trichomes. But I haven't been able to do that to this point.