Footholded!
This box makes me think I will never ever in my lifetime achieve anything on hard/insane boxes on my own. Not a dent, not even a scratch. Couldn’t have done it without all the hints in this thread, that’s for sure.
Together with my attempt 2 months before, I’ve easily spent 12 hours on this box without any progress. Too tired to continue right now, but at least I’m confident I’ll get user this week.
@hum4N3rd PM me if your question is still unanswered