I cook a lot of half chickens for fundraisers. I use both a mobile cooker and my CS as needed. I have one mobile rig that can do ~200 halves at a time, and another that can do ~600. All chickens are either brined by me or ordered pre-brined. I prefer to do my own brining for flavor reasons, but sometimes have no choice in availability.
You may want to use a short brine or no brine at all in a CS because they hold moisture so well. Your choice will also depend on how long you need to hold the cooked bird too. I would suggest a short brine though, using flavorful ingredients. I go heavy garlic and sometimes rosemary on mine. Others use beer, wine, or other spirits. Experiment.
Chickens are cooked to a "just done" point, then stored in a hot box (cooler) for about an hour on average before serving. I consider this an important step because it lets the occasional undercooked piece to finish off in the box, thus reducing any complaints.
In a restaurant setting you can use some version of this to allow for holding times. It also gives you some flexibility in cooking times because it makes your supply more elastic. You can hold chickens in a heated cabinet for several hours.
I believe that finishing on a grill or in a hot broiler will be necessary to achieve desirable skin texture, but this shouldn't require more than a few minutes per piece. YMMV
You'll need to be prepared to run out, or have some use for left over chicken. Soup or stew is the usual resting place for unused bird, but if your chicken proves desirable, then you can use the threat of running out to get customers in earlier.