Using Air bag technology
To activate use a Water Witch Electronic Bilge Switch and also the skipper has one on there body so if your away the bilge switch could active the air bags and if the skipper was on board and was holes he or she could active it you could also have a phone app
On a new hull make insertable cut into the hull just above the keel joint or they could be made to be fixed externally with a good marine architect involved it would be a success I've sent this idea to Hanse Yachts because I think it has value and also some marine under writers as I also think it could mean if they were fitted your insurance premium might be reduced