That 10.14.2 fix never worked on the MB4,1. Interestingly, before the patch, F1/F2 summon up the brightness overlay icon, after patching, nothing happens any more.
About the 773kB CoreBrightness binary. Tried to patch, found the right offset but to no effect.
Can you provide your patched one, pls?
(Sidenote: There are two model_min offsets now: "BLR" (which has the right format to be the nightshift) and a "Harmony" - that seems new since 10.14.5?
"Harmony" model_min was already introduced from 10.13.6 security update that I patched too, I have to check better it seems I only included few model, and surely not MB4,1.
Anyway I find some similarities between HS 17G6030 and Mojave.
I mean this: https://support.apple.com/en-us/HT209635
But I don't advise to those who own a mac supported until El Capitan, to update their HighSierra patched, since there is an important firmware update.