The idea of having an anchor, sea anchor, inflatable sausage, etc. may help in various situations but don't seem to be a very solid solution to any real situation especially when you are separated from the boat.

I think it's best for each person to have a VHF that is both waterproof and floats on them. EPIRB for offshore, but they do take a bit if time to be effective, as in USCG gets the signal, confirms its authenticity and get a rescue underway.

As far as getting a rescue fast and back in the race, a chase boat for the fleet is probably the best bet.