Salutations to LyX-users.
In tex.stackexchange  a working solution has been demonstrated by
egreg on how to correctly print Greek (characters) as/in pdf(LaTeX)
bookmarks. I recall a similar question of mine (and suggested solution
from the hyperref developer) in this list  (which, for various
reasons, I "forgot").
Now, egreg's solution does not work inside LyX. The reason is that the
documentclass option "english" (in my work using the scrbook class)
forces all characters to be converted in Greek.
The question is if it is possible (and reasonable) to tell LyX not to
pass the "english" option to the documentclass definition?