II have been salivating over the idea of this since I read that foodpickle this am.
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Aki Kamozawa and H. Alexander Talbot are the founders of the culinary consulting business Ideas in Food.
It's not exactly "maple pepper" but you can make a wonderful seasoning using freshly ground black pepper, maple sugar and salt. If you want a slightly different texture you can do an internet search for maple flakes, they are similar in shape to Maldon salt. You can mix the maple flakes with Maldon salt and finely ground pepper (it will coat the flakes) and use it as a finishing salt to add to roasted meats, fish and vegetables just before serving.