Paul,
Many of the companies that manufacture and/or sell domes will do consulting, inspection and even repairs. The question arises as to whether or not you need someone who is licensed in that location as a contractor or otherwise licensed/certified engineer. Often you will get better information from a dome specialist who really knows the craft, even if they don't have licenses and certifications. If you have them issue a report, it can always be turned over to those who would be responsible for the final design, proposal, repairs, etc. I've actually had several dome company owners tell me stories of the times they were hired to do just what you are asking, even for domes that were not theirs, and in fact had to guide the contractors and engineers who were conducting the work. Too often they would have done it wrong had they not had the participation of a dome specialist. If nothing else, you can run the proposal/plans from the licensed people past the dome specialist as a review, just in a consulting capacity. With any luck, they will help you prevent a train wreck, or save you some money/time with suggestions that would otherwise been overlooked.
Dx G