I think that is a very good idea!

Porting a double rifle will not only modify the upward movement of the barrels in recoil, but will effect the side motion as well.

The double rifle depends,on the recoil "FLIP" of each barrel to move away from the other barrel, and upward at an angle to regulate.

The sight is alligned on the aiming point on the target, but the RIGHT barrel is pointing to a place that is LOW, and on the LEFT of the aiming point, while the LEFT barrel is pointing to a place on the traget that is LOW, and on the RIGHT (lines of sight through the bore crossing).

When the trigger is pulled on the right barrel of a porperly regulated double rifle, useing the proper load, the the recoil causes the barrel to not only move UPWARDS, but to the SIDE as well, so that it is pointing to the place where the sights were when the trigger was pulled by the time the bullet exits the muzzle of that barrel.

This is a very comlex set of movements needed to shoot to the regulation built into the rifle. When simply mounting a scope on a double rifle improperly, or useing the wrong load can absolutely destroy the regulation, IMO, porting a double rifle would be just too risky! However, Justice, it is your rifle, so I'm in no way telling you what to do, but simply making you aware of the pitfalls of such an action! I would say the minimum for a new set of barrels would be $10,000 USD and upwards of that in most cases!