Thanks for the reply! I actually was just coming back to give an update.
Yeah, I'm thinking you can't set the specific palette, but you can limit the colors and then do it manually. I'm currently in the process of importing the pictures in PC Stitch, changing it to the scale I want, and then copying them manually to KG Chart (since I don't own PC Stitch and honestly, the program confuses me).
I've actually found that I like a sepia scale better; less color variants and it has a possibility of having over 24 colors, of which I have 16.
Do note, the colors blend a lot better than it looks like in the picture.
For this, I'm using (in this order):
White, Ecru, 543, 842, 613, 3032, 612, 611, 610, 3781, 3031, 838, 938, and 3371
I'm too poor to pwn, so I r3nt.