Altering Overworld Palette Offsets

Uhm... I think I should just make an example of what I DO want to do...

I already changed the palettes, everything there is a-ok. But now I need to switch characters to load other palettes than their default. I need Cyan and Celes to share Terra's palette, amongst others.

From what I get, what I'm being linked to is the ACTUAL palettes, as in, the colors and stuff? I need to tell the game "Load Celes with Terra's palette on the overworld", NOT mess up the palettes' colors.

...I'm kind of confused.

I've tried both FF3SE (who edits battle palette association just fine, but not overworld ones) and Lord J's own sprite editor (which lets me VIEW characters with others' palettes, but won't let me CHANGE their actual palette association unless I change the entire palette's color, which isn't an option because then everyone else sharing Cyan and Celes' palettes also get screwed up).