It's not possible to extract the palette from a ROM without some serious AI, because the palette does not really exist until written to CRAM by the game program.
I've got my CRAM -> RGB list converter (based on the palette conversion routine from trzy's
vram2bmp fixed now, and the color listing from the VRAM dump of the Japanese BIOS title is
here.
Unfortunately I haven't yet added a routine to determine which of the four 16-color palettes the logo uses, but it should be a fairly simple process of elimination since there are only four possible palettes. If not, I'll see if I can hack a routine in that uses a save state... let me know if you need this.
Hope this helps.