777 cptn ,
Can honestly advise that I know of 2 ansett cabin crew who made it to the other side of the cockpit door. One with ansett and the other in general aviation flying business jets. It is possible to do. I guess one thing going in your favour would be your operating knowledge of the industry in general . The guys I know of virtually spent their time off flying and used the cabin crew wage to pay for it until they got a paid G.A position.
Good luck to you.