Make the motorcycle truly invisible
Specify “no wheels, seat or handlebars beneath the rider.” The officer can have a visible hover bike, so attach the restriction to the rider rather than every vehicle in the scene.
Keep the rider recognizable
Use one clear rider reference and ask for the same face, hairstyle and clothes. AI creates a fictional helmeted officer. Keep the two identities distinct throughout the chase.
Keep the action short
Start with the invisible ride, reveal the chase, add a playful flip and finish with the getaway. Timing is a direction for the model; exact choreography and likeness can vary.