>>2216927You're right about the sea anchors it would need an anchor point to ever work or it just acts like an underwater sail.
speaking of anchor points, in deeper water would a chain act as a good weight, in shallower water it could also then act as an anchor if needed. There is a device called the stevtensioner that can help lay anchor chains in various patterns which maybe very useful.
https://www.youtube.com/watch?v=nnWGVfnTVKoCould the best / most useful ballast weight be batteries if they were robustly encased. It would sort out energy storage from any wind / wave power setup.
