Essentially you want hang time of the punt? Additionally, you want that hang time to stay for the duration of that play? That can be accomplished rather easily with just the FX timer feature, and then a snapshot of the final time, you then crop and allow it to remain static in the corner as the runback or fair catch continues.
For some sports I've found it handy for a camera to just shoot the scoreboard and then use that in a PIP and shrink and overlay.
Jeff