However, Euro type locks on wooden doors are quite rare. They frequently
require considerable modification to the door, as they generally incorporate
espagnolette mechanisms, or considerable hollowing out of the door for a
mortice type.

I don't think that's true any more. Euro profiles in the last 2 flats I
had in London, and the last 3 offices I worked in, all as mortices in
wood(-ish) doors. Particularly in the business environment (or anything
commercially leased), I think they predominate due to rekeying from
time to time.