I am certainly no expert on the issue and I don't use it myself, but Hahnemuhle produces a protective spray for its papers. I'm not sure if the spray is designed for their matte papers or not, or if it's designed to protect from said problem, but it may be worth checking out.
By the way, I've also noticed this problem, and it is quite annoying when a nearly perfect print is ruined by scratching. I hope there is a reliable solution out there!