Plugin / scripts for paintings by numbers (heeelp)

We are engaged in the manufacture of paintings by numbers from a photo. We need a tool that can help with Image Trace, limit the illustrator's use of colors from our palette, that is, a function in which it will be possible to set the required number of colors that the illustrator can use. After that, the illustrator also needs to divide the created image into outlines. After that, it is necessary to number these outlines with numbers. The illustrator also needs to calculate how much paint (in milliliters) is needed for this image / painting based on its size.
I am attaching an example of what the final result of splitting a photo into contours looks like (file - 1)
And a list of necessary paints for coloring (file - 2), other ways of displaying this list are possible.

At the entrance:
- Raster format (photo)
- Color palette 250 colors

At the exit :
Painted layout
Pattern along the contours (vector) + raster along the contours
Paint consumption + contour number and corresponding color name for this contour

Control:
- The required quantity for a single painting is no more than 30 colors.
- Adjusting the number of contours + selection of non-processed area
- Adjusting the sharpness of the contours

We cannot solve the problem for a long time. Willing to pay money. Thanks for any feedback