Neither the Kaiserliche Marine, Reichsmarine, or Kriegsmarine used pennant numbers for their capital ships, so I'm not entirely sure where you're getting the CVE designation, as that was a primarily US practice. Additionally, only the Kaiserliche Marine used a prefix (SMS), and using "KM" as a prefix is a bit of a "History Channel" trope.
Thanks for your input. The CVE I mentioned primarily for the users here of SB, because I presume everyone knows that this stands for "CV escort". The DKM did not use the pennant numbers, correct, but in my AU certain classes will use them, if the ships in class are numerous for facilitating the distinction between ships. If the DKM had in those times a total of, say, 24 "Zerstörer" of more or less the same characteristics, I deem it useful for everybody to know which one is Z3 or Z15, for instance... Why not? As for KM I shall put in future always DKM, is that correct? Sails up!...