I'm not a wet darkroom expert, but I know you can make a passable B&W developer from a number of things, Tylenol, coffee (soda? beer?) and it seems like most of the ingredients of color chemicals are common, except for the CD3/CD4.
I assume Fuji makes their own. Do they?
Oh really? Kodachrome in the public domain, huh?And, BTW, Kodak vacated the patent, thereby donating it to the public.
I just remembered a conversation from maybe a year or so ago on one of the boards, could have even been here, where they were talking about one of those old film processors, probably Rocky Mountain, maybe Film Rescue, trying to re-formulate the color developers and dyes for K12 so they could actually get color from that film again. I never heard if they were successful or not.