I think you are making this your problem. It is the dealer and mfr's problem. Have them add the Drings to your spec at their location. If that can't be done, go to some other outfit in your region and get what you wanted in the first place. Even if you have to wait. You won't be satisfied until you are satisfied
If I understand the current situation, the dealer is making a financial adjustment. It seems this is the best it's going to get in the current situation. Again, I would install recessed deck hold downs bolted through the cross members, if this would provide the required attachments. This would minimize the potential for noticeable damage to the powder coating. Move forward and chalk it up to experience.