I would expect that, from the Pardey's viewpoint, they would want more than a one time sea anchor or drogue. I would also speculate that they would be ready to resume sailing prior to conditions completely abating. Numerous oceanic areas are more remarkable for their brief lulls than they are for the rarity of heavy weather. Bringing 250' of line, even at diameters less than 1-3/8", back on board with the cones would be taxing and I wonder if most boats would have a capstan on board of a size to handle it complete with the cones. I'm not entirely sure you could buoy it and have it still perform it's job. The Pardey's sail without motor and so, manoeuvering about for recovery would be somewhat complicated, if even possible.
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.