Not only tried...
View attachment 3819006
I've somewhat figured out how the system works. It's separated into sections like this:
View attachment 3819016
The order is:
-top
-bottom
-full body
-underwear
-outfits
-hair
-shoes
-head acc.
-other acc.
-body acc.
-earrings
-nip pierc.
-clit pierc.
-butt plug
-tattoo
-tanlines
-bikini zone
-makeup
Each section has a row for each character which are basically in the same order as they appear on the customization list except that Wei and Michelle switch places.
If you unlock items that do not exist in game it can mess up the whole customization system. Also, when you unlock stuff in the story it can lock some items again. This happened to me in some older version at least.
In the end of the save file there are these rows that control what sections of the customization are available (bikini line, butt plug etc.) Putting three 1's in the beginning of each row seems to unlock everything.
View attachment 3819131