Cool idea, but here's what I would probably do:
First, it would be a separate type of movement that you could buy (like flying, swimming, or walking/running) and you would buy it separately from any of those. The cost would probably be something like flying, where it costs 2CP per two inches plus it's structure level.
You are able to teleport/travel that many inches, but there is a skill roll involved, like your version. The skill roll starts at a use of 2 for 2 inches (which would be the minimum distance that you could travel while using it) and for every 2 inches after that it goes up another 1 (so going 2 inches is a use of 2, 4 inches is 3, 6 inches is 4, etc.).
If you miss the skill roll, the minifig lands somewhere else, a distance of however much the use roll was missed by in inches away from the targeted spot. The opposing team member decides which direction.