If you want to be an instructor, then instruct. I know I'd love to teach. But I'm not convinced it does anything at all for those waiting for an airline job.
Airlines are interested in professionals who will make good senior employees. Does 1,000 hrs Cessna demonstrate that? Maybe not.
Does teaching CCTs and visual navigation help keep the specific skills that the airline are looking for sharp? I'd need to be sure of that.
I can think of better ways to impress an Airline recruitment panel, but then I've got no rank on my shoulder to back up my opinion!