+1 for Bugs to forty's advice. When I went through OASC, they wanted to hear strong and confident answers about my life/career progress/history regardless of what it was, not specific words to tick boxes.
Have you visited a flying station and spoken to WSOps? (Can you still do that?) If you do, ask to speak to some of the junior WSOps on the squadron and ask them about their application process. Also try to speak to some of the SNCOs about what challenges they often see new joiners have. You can then start to see if and how experience as an airman might help you. After a few years of doing the actual job it's very easy to forget how you got there so try to speak to currently serving folks.
Good luck!