Install electric windlass
Some boat manufacturers set up the windlass circuit so that you can only operate it when the engine is running...That seems like a pretty good idea since it would keep you from accidentally running down your battery and being unable to start.
If you choose this option I''d use the starting battery to run the windlass.
I had the good fortune to have a friend suggest that I get the manufacturer to pull the wires when the boat was being built. I have 02 wires to the chain locker. That should be plenty to run my lighthouse windlass.