Hi there- anyone have experience getting their handmade listings changed from "generic" to their brand?

I've had several fba handmade listings under the "generic" brand for a while since I was not listed in the Brand Registry. I went through the process of initiating a Trademark through Amazon's IP Accelerator and was approved for the Brand Registry. I'm now unable to change any of my listings from generic to my brand as Amazon no longer allows changes for that category after a listing is created. When I first listed on Amazon, I was able to list any brand I wanted, so I wasn't aware of this change. I don't wholly understand the logic, and I understand it even less for handmade products. These products are mine that I have designed and made...they should be able to be listed under my brand name. I have reached out to seller support but just received the policy language in response.

I get that this policy is in place but wanted to see if anyone had any success in changing to their brand from "generic" before I recreate all new listings and send in FBA inventory. Thanks!