On my last CRM course out 12 pilots present, 8 had been Cabin Crew but...
All of us were self improver, therefore we had qualified before /whilst working as crew and only one or two had worked for our present employer.
Possibly a good way to make contacts though a friend of mine worked for Sabre and got a 727 job within 3 months of working... Not with Sabre though but because of it.
Like anyhting when it comes to get a job, no magic receipe.
PS: Just remembered that a few years back BA ran an internal recruitment drive. Qualified people to apply only but some had been engineers, some had been cabin crew.
Of course by the time I joined BA though, it was over...