Slice an external image with given Row and Column amount

Recently Skybase showed me an example filter that slices an external image vertically into 10 parts and uses each as the desired effect's particle source. (Filter: https://www.filterforge.com/filters/10265.htmlhttps://www.filterforge.com/filters/10265.html)
This filter is great but it only slices image vertically.
I wonder if it is possible to give the user the Row / Column slice amount option at the same time using loops.
Imagine I have 25 different glyphs given in one image. (like 5X5 grid image. Please check image link:

Code
https://www.dropbox.com/s/efk26y2pzfs6jat/question.jpg?dl=0 )

It's beyond my Filter Forge knowledge currently so I've decided to ask. I tried to make the first steps using curves and Curves to Shapes snippet. I guess it works as a single slice equally divided curves with using RGB Math.

Code
[IMG]https://www.dropbox.com/s/u2ib2jtkxst5dpi/question_B.jpg?dl=0[/IMG]

I know it's possible to cut a certain amount of cuts using offset. But It would be even more useful and open for users to set Row/Column slice amounts.
Or maybe Map Script can help.
Thank you.

Any Cut.ffxml

Rachel Duim have made a filter that is able to cut a grid of source images, although I do not know if this is what you want

You can see it here

Grid input by Rachel Duim

There is also another filter that is able to cut a single image vertically and horizontally but I do not remember now where is it

Sure, this version is modified to work with luminosity mapping. You can change the tile count from 1x1 to 10x10. Don't forget to also check enable HDR in the color control, if you're using hdr images. Hopefully this works as intended.

sprite_sheet_bomber_v002.ffxml