1/ Maybe that already exists.
The H2 palette is a 256 colors palette.
So do gif images.
We just need a program in which we can select the palette when we export/save in gif!
With the hope that this program can pick the closest color in the palette...
2/ An exe file that would convert hundreds of images into H2palette image in a row, that would be great...but maybe not much more useful than the "1/"