It's normal for an architect to be refused once or twice on any application however plain.
That your situation is "sensitive" (in what sense you do not define -- one assumes in either the scenery or the commercial senses) can only make it more likely to get a rebuff or two.
A lot of older council planners will smack down every new proposal as if it was a cat that jumped onto their Sunday dinner table.
As you are a contractor/developer you ought be well used to this no,no, yes game.
Has your original architect has given up on the project ?
If not, you just have to show faith in your man/woman.
Sure, sometimes one can't go into details of a sensitive proposal.
A schematic sketch of the site, showing the main road, the existing entrance, the proposed one.
Maybe a sketch of the whole thing as seen from the bay would be a good idea.
But maybe its acute sensitivity would stop you showing us this.
I sure hope it's not like the job in the photo attached, where a new ranch-type house is
slapped across an old existing on just ashore from Slea Head . . .
If it's like that, then I'd support the planner for slapping you down.