These can be repaired with conventional inner patches. Tire stores don't like to do it because of the yukk they have to clean off to do it. I've lost the link to the Michelin website page that shows how. I got it to try and convince a Michelin dealer to patch the tire with no luck--They said it couldn't be done, and Michelin refused to contact them to explain otherwise.
Which is why I carry a copy of the official Michelin document (with pretty pictures) explaining the procedure.