Can't help if you're looking to fit a windlass in the centre, but on Spring Fever, we: -
Unbolted on end of the original timber-pole cleat and loosened the other, swung it through 180 degrees, re-drilled the deck and re-bolted it so it was circa 4-5" further forward. We then got a fairly standard 9" stainless cleat from a boat jumble and drilled bolted that immediately behind it, with a big s/steel plate below the deck to spread the load. We made and fitted similar plate to the underside of the original too, as we discovered that as 'standard' it only had a small 5 x 1" strip fitted to spread the pull of the bolts. It's worked well ever since - 8 years.
We did consider moving the cleats to either side of the bow as you suggest, but decided that this would result in more redundant holes to fill-in and that we might also need to drill out/strengthen the deck's core at the new fitting locations; in the middle of the deck we at least knew that the core there was a solid bit of wood.
Bob