My advice would be, that when trolling flamebait, it is in fact possible to be too obvious. The way to do it is to post a few more than 3 posts with you new alter-ego, about innocous stuff like what kind of headsets to wear when SIC in a PA31. Build up a little bit of a reputation and get people really believing you're some bright-eyed young CFI. And don't just put it all out in one sentence. You have to make it a story, with drama, and maybe an anecdote about how ALPA screwed over your grandpa.