Yeah appendictis is scary stuff. Hopefully he's back to full fitness soon enough!
Personally I think a red flag with a guaranteed restart for at least two laps with a rolling start is the way to go. If a safety car enters on the penultimate lap or later you finish the race under yellow. Since you're allowed to change tyres under a red you can at the very least have a scrubbed set of softs available for that sprint.
I'm completely against the standing start after red flag thing altogether either way, that's artificial nonsense. There should only be one race start, anything else is a restart and that's single-file and rolling.