After trying several different suction cup pullers, I finally found one that will consistently pull out the center cap. However, it will not pull out the silver center caps on S/X wheels.
New Heavy Duty Suction Cup Car Dent Remover Puller Auto Dent Body Glass Removal Tool-in Hand Tool Sets from Tools on Aliexpress.com | Alibaba Group
Quick video in action:
New Heavy Duty Suction Cup Car Dent Remover Puller Auto Dent Body Glass Removal Tool-in Hand Tool Sets from Tools on Aliexpress.com | Alibaba Group
Quick video in action: