The "special kind of phenidone" you refer to is Kodak's "Dimezone S" and it works like Phenidone but needs about twice the amount per volume. Its main advantage is that it is stable in alkaline environment, but if you use the working solution on the same day, for all practical purposes Phenidone works just as well.

As far as CD-3 (the one you want for E6) is concerned, this should be fairly easy to obtain since RA4 also uses it, and RA4 is also used for making digital prints.