here for a recipe which comes from Fuji's patents and which has PhotoEngineer's official blessing. All Cd-x compounds will produce colors, but with slightly different hue and stability. Since the dye couplers in E6 are specifically made to work with CD-3, that's what I would use.
You will have problems getting the highly toxic 1-Thioglycerol, but it can be substituted by other compounds or left out at the expense of a bit longer bleach times. The stabilizer can be substituted by a simple recipe provided here. If you do that, you don't need the "Formaldehyde sodium bisulfite adduct" in the prebleach any more. The "Nitrilo-N,N,N-trimethylene phosphonic acid pentasodium salt" is a chelating agent which you can leave out if you use distilled water. Note that you will have to adjust pH if you change compositions!