No, I've never put out a pack of the all the original assets.
I know other people have done full rips of the game before, however after version 3.4, Ferdafs started atlasing the images, making recovery of the originals impossible (at least the way I do it). Images in the game files went from looking like this:
View attachment 2883929
To this:
View attachment 2883928
While I still have a copy of 3.4, versions after that are... incomplete on my end. The way I've been getting images from 3.5 onwards is to "turn off" the UI via script injection, then run a screen capture program I wrote to grab the images off screen, run them through a diff to cut out repeats, and capture any additionals by hand if my screen cap script failed to get something. After that they go through my own image processing step (slicing) and I don't keep the originals.
All that being said, the renpy game and the uncompressed image pack do contain at least the base layer for all the images in the (Unity) game (as well as image that were never used in the unity game but included in the files, plus any extra scenes I've added). The expressions are separate transparent layers. They can all be reassembled if desired (enjoy 10,000+ images!), or you can just pull out the base files (almost always with the file name 0.png). Here is an example of the file structure most layeredimages us:
View attachment 2883945
Let me know if you want any additional info. And good luck! Hope the AI thing works out!