Scoop 1/2 cup of thick coconut cream remaining at top of open coconut milk into the blender, opening second coconut milk can if needed. Add strawberries, jam and 1/2 teaspoon vanilla and blend until smooth. If too thick, add just enough milk alternative to get things moving. Blend in sweetener, to taste. Divide half of strawberry mixture between the two glasses on top of the banana layer, leaving half in the blender.