Those foam tramp skis wouldn't be beneficial at all. The size and weight are not representative of a regular pair of skis, so the swing weight would be different. Also, you don't use ski boots, so that's more weight that isn't factored in. Keep skis on the snow where they belong. Just pretend that your feet are "built in" tiny snowblades and do what normal people do on trampolines. Or duct tape pieces of cardboard to your feet, whatevs.