Bill B wrote:
Peeling off the green vinyl looks to be the easier option. If you had to respray the rail, masking up the inside of the car will be fiddly but is not impossible. Steering wheel/column removal would give easier access if painting.
I agree. The vinyl should be easy to remove depending on what the PO used to stick it on. A heat gun and/or some solvent brushed in behind as you peel it off should do the trick. Then clean the surface thoroughly to remove glue remnants, mask up well with paper and spray.
To match the paint colour take something removable such as the rear number plate flap to an automotive paint supplier and they will make up a spray can in that colour so you can do it yourself.