I've been following your thread and wanted to share a finding with you that may make your updates a lot easier.
In looking at both madden 25 and Madden 12 rosters in excel I found that both rosters are made exactly the same.
So today I took a Madden 12 roster, opened it in Horizon, replaced, saved and rehashed Rondos updates Madden 25 file over it.
It loaded and played with no problems in Madden 12.
A few players had the green face issue. This was easily fixed by setting all the Heads to 0 using the madden editor.
Some helmets and face masks had to be updated as well.
There is also an issue with the commentators stating the wrong names but was able to correct this issue as well ..
Wanted to share as I know how hard making updates can be
Hope this helps in your updates
Thanks, Cage