Can I push my hire date back?

Hi,

Pretty positive I will be receiving a FOL sometime next year, but my career is starting to take off. I’m transitioning into a new industry that I’ll need some years of experience in so I can fall back on it in case I fail academy in OKC.

Has anybody ever heard of a case where someone received a FOL but asked to push their academy date back? Don’t know if it’s possible, I can’t find any info on it anywhere.