To anyone following this guide blindly - watch out for the inis:
https://rentry.org/mys8q
Once I switched my brain on I noticed that, clearly, the hekate_ipl.ini section as presented there is missing stuff. D'oh.
So, now it appears that I have somewhat succesfully migrated from SX OS, and I'm booting into Atmosphere.
'Somewhat', because although I'm booting and backups do run OK, I'm also getting the dreaded "failed to match warmboot with fuses" error, and so sleep doesn't work. Kinda frustrating being this close, but not quite there.
Mariko unit, my emunand cfw matches versions with my ofw (10.2.0), but I noticed that I have 14 burnt fuses which seems to be incorrect, and may be the cause. Second-hand console, don't know the exact history.
What I deduced is this: for whatever reason my ofw is on 10.2.0, but to match the fuses it should be at least 11.0.0. Am I right on this? Do I need to update my ofw to 11? Do I end up with 15 burnt fuses if I do update it to 11? Can I update my emunand to 11.0.0 or 11.0.1 via Daybreak instead?
Any help is much appreciated.