Interesting question!

From experience with shotguns I can tell you that once the cross pin is enlarged and the barrels pushed back there is not provision for refitting on the circle. Which kind of casts doubt on the initial benefit of that process in the new SXS.

Double rifles may be different.

In OUs it depends on the type of lock up, whether it is the Merkel or Browning underbolt or the Boss type. On some Boss type actions there are prefitted contact points that can be replace to maintain the contact between barrel lugs and action body, such as the high end Rusian MCs, the Beretta SO and others. On the Merkel types there spce for building up the front of the bites to maintain contact.

Also worth mentioning is the French Sagittaire that does OK in calibers that include the 8mm with no side lugs at all. The barrels are held solely by the cross pins and the bifurcated bolt.