I have seen a few saltwater ramps and such that are actually cut into the shore, above high tide. Boat houses too. Money becomes more of an object but it makes some of the issues like sediment migration a smaller point.

This question, though, highlights a real problem we have. We approach a project with "I want to build X here". That immediately sets up a conflict. Rather, "I want to do Y (launch a boat, keep water out of my basement), how do I do it?" Best projects I got built were where we started with the result and worked backwards.

It changes the mindset of all involved to what would work. I do know, though, that some regulators don't want to do this as it means they have to propose and support rather than simply say no. It also meant that I and my crew had to learn new ways of doing things. I had a really smart crew.