Use a sharp, heavy knife to score the top and sides of the ham in a diamond pattern. Make diagonal cuts that are about 3/4-inch (2-cm) deep and spaced about 1 1/2 inches (4 cm) apart.
In a medium bowl, stir together 3/4 cup preserves, the Creole mustard, mustard powder, ground ginger, and pepper. Spread half the glaze over the top and sides of the ham. Reserve the rest of the glaze.
Pour the ginger beer into the pot of the Instant Pot or pressure cooker. Lower the ham onto the trivet in the pot, cover, and cook on low pressure for 15 minutes. Let stand for natural release for 3 minutes and then quick release the remaining pressure.
Lift the trivet out of the pot and transfer the ham to a large ovenproof skillet or rimmed baking sheet. Leave the cooking liquid in the pot. Spread the reserved glaze over the ham.
Position an oven rack so that the top of the ham will be about 5 inches (13 cm) from the heat source. Preheat the broiler.
Broil the ham until the glaze is bubbling and browned and the diamond pattern opens up and gets crisp on the edges, 6 to 8 minutes. Let stand for at least 15 minutes before slicing and serving.