Kodachrome home processing would of course require some experimentation on exposed b & w film, which CD would work best ;-)
Another question in regard to the original patent: already the Ektachrome E-4 process had replaced reversal light exposure by chemical fogging with tert-butylaminoborane; the K-14 patent gives borohydride as the reagent. Now the first is said to be quite toxic, and has been replaced in E-6 by borohydride, but the latter may generate explosive hydrogen upon decomposition or accidentaly with acids, so that both compounds may not be available to the darkroom amateur.
Would it make sense to expose the cyan- and yellow-processed film with broad-spectrum white light to achieve the reversal exposure for the magenta development? For a (hypothetical) micro-K-Lab, red, blue, and green or white LEDs might provide suitable light sources for the dedicated reversal exposures.