I mean, making your own reversal process sounds very cool, but why would you base it on Kodachrome style technology other than, say, E6? Kodachrome seems colossally complicated.
Or is a Kodachrome type emulsion actually easier to homebrew?
If it's some particular image characteristic of Kodachrome you were after (e.g. colour balance say,) is there no way of trying to reproduce that characteristic but using an E6 type approach?
Of course, I accept as a perfectly valid answer to the "why?" question "because he can." That's the best reason going as far as I'm concerned