No doubt it is all "doable".
a customized Sikorsky S-92 twin-engine helicopter
At 173 miles offshore as quoted I guess that means a big fuel tank? Out and back, time on station, reserves etc. Or maybe the standard legs are enough as they are pretty long? GE engines after all are pretty frugal.
Can't help thinking it might feel a bit lonely out there at that distance! Although I think they will still have some sort of vessel out there in case they "miss" and still recover the booster.
Certainly be "interesting".