As far as I know, SX OS 2.3 can push henkate and create emuNAND (sort of, but i don't pretend to go online right now anyway, so this kind of emuNAND works just fine).
So i'll have a emunand on 6.2 and my OFW on 4.1.0 without burned fuses.
yeah the problems came up with 2.4, they were previously working fine with 2.3. so that is a good point, all your steps are fine if using 2.3. I don't know why i read it as you were going to use 2.4. that's my fault.