Mike,
If your cams or followers are chrome plated and now starting to peel, I fear you have more problems in store. Firstly, chrome plating is not to be reccommended for recovering highly loaded components such as roller bearings or cams and followers - the high loading tends to make the plating creep, and eventually break free from the parent metal. The loose fragments of chrome then get transported by the oil and being glass hard, attack any other moving parts, especially the bigend bearings. An even bigger problem occurs when these hard grains get embedded in soft metal like alloy pistons - which then become hones that wear away the bores.
The factory never supplied chrome plated cams or followers, so to put the records straight, original Douglas cams and followers were made from case hardened EN32 steel (or an equivalent). This is where most of the wear problems started as it is bad practice to run two loaded components together when made of the same material. Dissimilar materials - say EN32 & EN36 - have much better wear characteristics under these conditions. If your cams have been chrome plated, then they were probably ground down first so that the finished job would have a constant thickness of plating - this has probably resulted in the case hardened skin being absolutely minimal as the original blanks were only case hardened to a depth of about 25-30 thou (before grinding).
Moving on to your attempt to use Royal Enfield followers - if you are going to modify and then re-harden them, you are likely to have distortion problems due to the heat involved. Easier routes would be to use new followers from the LDMCC spares scheme or have your followers faced with 'Stellite'.
From your posting, you seem to have oversimplified the process of cam grinding - the base circle diameter and the lift are only 2 of the critical dimensions - you also have to take into account the opening and closing angles and the cam profile. For reference, the standard 'T' cam used in the Mk4 had a base circle of 1.000" dia and a lift of .187".
Regards,
Eddie.