There are blokes I know of who were railroaded into CC dept
for 6-8 months till pilot slots opened up.
Only advantage was being streetwise to the duties of the girls
down the back at any point during the flight and CC SEP was
ingrained in them more than what is taught to us about what
they do. FOs who formerly did stew work could easily take on
emergency duties of the Purser if she was rendered incapable
of doing them.
Advantage? Maybe. You could always say at the interview you
have observed tech crew duties, responsibilities etc and know
exactly what you're getting into.