"blue biplane Charlie Delta, from yellow cub Charlie Delta are you about to turn final?"
"no, not yet, I see you at the hold, you've time to depart"
That's totally unnecessary and thus a waste of bandwidth. When you're (on a non-controlled field) at the threshold and ready to go, check the airspace. If any plane on final or perhaps long final (where allowed), wait until landed/gone. Otherwise "line up and immediate departure". It doesn't get any simpler.