CustomizeMii.... That's the one! I don't seem to have it anymore I'm afraid and wow your right, it doesn't seem to be out there. I could only find fix94's open source version which uses the same banners and I would put them in paint dot net and try the hue slider but if you want the exact colour, use the colour picker tool on a screen shot of the video. If you want any help gimme a shout.
Here's a link to fix's if you want it, the only other alternative I can think of is rerun the hackmii installer to see if it lets you only install the hbc and then dump it for editing.... Its been so long i can't remember if that's even possible I'm afraid