Sandblasting plastic is possible...
But you have to use low pressure (50 PSI or perhaps less) and also a gentle media (like baking soda).
A wide nozzle helps as well. You want to keep the friction/energy you induce, spread and low, to avoid melting spots.
That said, I don't know about the rubber coating, and how it will react to the sandblasting.
There are coatings that are very sticky and won't get off well trough abrasion.
Perhaps a bit of a gamble....
Btw, there was a old related thread:
https://geekhack.org/index.php?topic=39533.0