I lost around 6" in scope height when I switched from the tripod to the pier.
After looking at several possibilities, I almost stumbled on a SkyWatcher Tripod Extension, that adds 8" in height and should work just as well on a pier. It did mean that I had to lower the Pier Adaptor by just over an inch, but the whole process was very straight forward.
Just need a clear night to try it all out now