WOW! The possibilities!
Reminds me of "Screaming" Lord Sutch's early European pirate station Radio Sutch
https://en.wikipedia.org/wiki/Radio_City_(pirate_radio_station) located on a Maunsell Sea Fort of the coast of England...
Like these, your location offers an ideal ground with a steel structure standing in salt water
plus a 1/4 wave tower to hang a sloper from or possibly shunt feed (I hope you've got lots of pull there).
Even still, a kite supported vertical off the leeward edge would be very effective and out of the way.
Impressive!