Talk:KISS notation
Your reasoning for choosing C4 as a standard pitch seems to imply that A=440 Hz both forces two reference pitch standards and has some sort of intrinsic disadvantage for people with absolute pitch.
I don't believe that either of those are generally true for any reason.
One could simply choose A=440 Hz and build all tonal definitions from A instead of from C. It should make no difference at all unless one chooses a tonal system that either does not define an A or does not define a C. I would be inclines, myself, to think that A makes more intuitive sense as a starting point, being the first letter of the alphabet.
I may be mistaken, but I don't see why anyone with any form of perfect absolute pitch in a microtonal context should think it easier to identify a C than an A, nor any named note from any other named note, arbitrarily. For those without perfect absolute pitch, but with some sort of good relative pitch perception might see an advantage in a reference standard that is a harmonic of whatever frequency AC electrical service is in their country, but since both 50 Hz and 60 Hz are widespread standards, both 261 Hz and 440 Hz would be equally bad, in general.