That is more the oem style ladder some bass boats come with.
As far as price goes there expensive. I would browse the net and look for a used one. Or just go with a more univeral one that mounts to the cleat like you were talking about. As far as it damaging your boat I would just look to see how your cleats are mounted. Alot of them are through bolted with backing, if yours are like that I wouldnt worry about damaging the boat. If they are just screwed on I would explore other options.