What orange peel? The base coat doesn't have any, and sanding the clear coats removes all orange peel when done properly. It's very labor intensive and time consuming, and if someone else is doing it the cost will be significant.

You can get a very good finish by sanding out the top coat of clear without sanding between coats. Perhaps not quite the same level of perfection, but much better than the ordinary shoot and drive paint job.

No matter how good the paint application, no matter how even the clear coat is applied, no matter how well it's sanded, any imperfections in the body and any in the primer will be magnified. Proper prep is more important than sanding the finish.