As I said I'd land at Baker beach the top of which is just out of the picture on the top right of the Dilandu's photo. Getting to the cliff's overlooking the fort involves a gentle stroll up the bluffs and along the dip face of the cliffs. With the right carriage you could probably even get a 68 into position but it would be overkill.Unlike you I've actually been there. To anyone with any understanding it is embarrassing how easy it is to get above the fort with riflemen.
Those aren't cliffs BTW, they are moderate slopes. Easily scaleable, and you could drag a 20 pdr up there easily. This isn't the cliffs at the Plains of Abraham is it?
I just remembered Milne asked that Dunlop ensure he was well supplied with rockets for Vera Cruz. I wonder if Maitland was similarly equipped because a few dozen of them firing down into the rear of the casemate would be awfully ugly for the defenders.