This stuff is pretty common but annoying when it's somewhere prominent like the ridge of the nose. I've been fortunate to find pristine copies of my favorite figures but they are definitely the exception.
I wouldn't mess with any of the custom cowls for this right now as they're all a significant downgrade IMO and I have them all except Ben Choi.
It would be much better to gently sand and repaint this cowl than buying a new one. I'd even be willing to offer that service for owners of this since the character is important to me and I want people to have a good copy of it.