I used to run a sub community on here called "Regional Databases" but children and work ended that about 7-8 years ago thought.
I did a guide on it many MANY years ago
I do it manually everytime I set out on a new set of changes.
Rule #1 of editing is save new versions often
Rule #2 is make a little note about what you are changing or have changed
I save so often I have to keep moving them to an archive folder every hour or so!
I also keep notes and plan out my changes, knowing which versions to go back to and what changes to redo if needed.
If you are willing to learn you can make it work. First step is to import it into the editor.
it won’t be exactly what you want but it’s a huge chunk of work already done.
I have a Yorkshire club logo pack too, will hunt it out later.
Lincs & Cambs 4.28.fmf
If you have FM20 you can undo all my nationality base changes (people, clubs, stadia etc) and swap all my clubs with your nations clubs.
Might take a few days but wouldn't be too technically challenging.