If an S/O does not want to apply for a F/Os position, then it seems the HR dept has recruited the WRONG individual for a PILOT. If the S/O wants to stay an S/O then they are NOT pilots ? - perhaps mere flight deck secretaries?
F/O on an A320 wouldn't be that great, and the workload is much more of an S/O on an 777/787.
A320 they can put on an 12hour Domestic shift, going up/down the country in at times pretty bad weather doing 6 takeoffs/landings.
S/O you know that you've got 1 sector on most shifts, you get to over night somewhere and have an pretty stable work week.
A320's you're more an 9-5 on an shift.