Instead of a nonstick skillet, you can also use well-seasoned cast iron.
To double, triple, or quadruple the recipe, just use a larger skillet. The almonds don't have to be in a single layer as they cook, just when they're cooling.
As written, the recipe is gluten-free and vegetarian. To make it vegan, you could try substituting brown sugar, maple syrup, or agave nectar for the honey.