As you wish...you can pay them to open and load your O/U. Normally, you have to open the action for them to load...even if you have two shotguns. Paying extra is always an option.That's why you pay for the loaders and take a pair of guns.
I'd rather take a pair of semi-auto shotguns and have 5 shells (or more with extended tubes) and lighten the recoil a bit for this kind of volume shooting experience. Horses for courses ya know.