Painted Stripe Removal

If there is a chemical to remove the stripe and not damage the body paint, I would be interested in hearing of it.

An OEM stripe no doubt will not cover this "custom" one. Like said, repaint the car and add OEM stripe, or repaint the existing stripe your color. Just limited as to what you could do.
This is an example why custom work on these cars, that cannot be easily changed is usually NOT good when selling.