Suppressing AppleID prompt for Adobe Install User in El Cap?

Greetings all,

I work at a K-12 with a Mac 1:1 program for several grades. We're doing our big summer overhaul and re-image, and I'm hitting a wall trying to stop the Apple ID signin prompt from appearing, and effectively pausing imaging halfway through, for the Adobe Install User before the black "Finishing Installing Software" screen.

I've seen several threads on suppressing this prompt in the past, including https://jamfnation.jamfsoftware.com/discussion.html?id=12949 , https://jamfnation.jamfsoftware.com/discussion.html?id=4920 , https://jamfnation.jamfsoftware.com/discussion.html?id=9842 , https://jamfnation.jamfsoftware.com/discussion.html?id=9068 , and Rich Trouton's scripts that they link out to. We've tried lifting the various scripts described and implementing in our imaging configs, with no luck.

I eventually ended up writing preference keys:

DidSeeCloudSetup = 1;
DidSeeSyncSetup = 1;
DidSeeSyncSetup2 = 1;
LastSeenCloudProductVersion = "10.11.3"

...into /System/Library/User Templates/Non_localized/Library/Preferences/com.apple.SetupAssistant.plist, and to the English.lproj equivalent thereof, on our base image, which seemed to work briefly, for both the Adobe Install User and manually created test accounts we made on machines after they were imaged.

However, now we're back to the same symptoms.

You probably noticed above that I used "10.11.3" above, that's because we're imaging to that version because of the 10.11.4-and-later issues with 13" MBP Retinas, which make up most of our 1:1 fleet. (While we've seen articles advising updating to 10.11.5 and having the latest version of Flash, we've also seen chatter indicating the problems may persist for some, so we're just hedging our bets for now.)

I suspected that perhaps Apple had upped the live version that preference key is checked against, and tried upping it to 10.12 just now in a fit of nerd rage, but the AppleID signin still keeps popping up for Adobe Install User. I did check the User Templates content on imaged machines, and the preference keys are showing up there as expected.

One of Rich's posts at https://derflounder.wordpress.com/2014/10/16/disabling-the-icloud-and-diagnostics-pop-up-windows-in-yosemite/ has comments indicating this has broken for others under El Capitan too.

Anyone else running into this / managed to squish it? Thanks for any help...