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Setting up IPv6 networking can be a real challenge, especially with all the configurations involved. It looks like you've done a lot of troubleshooting already, which is great. One thing to double-check is the routing on your Proxmox host. Make sure it's correctly forwarding IPv6 traffic to your OPNsense router.
Personally, I use this dedicated server India, and it gives me full control over my networking setup, which might help in your case. You might also want to check Hetzner's documentation or forums for specific IPv6 setup tips since they provided your address block.

It can be difficult to manage Cloudflare API tokens without using the Global API key.
Have you considered using third party api integration services? When it comes to personalizing the way you connect various platforms—in your case, Cloudflare—they're pretty cool. They may have the ideal solution for you, enabling you to more easily manage those domain names separately.
Finding the ideal configuration is always a bit of a treasure hunt, but these services might provide an easier way. In addition, it would be fantastic to find out if anyone else has figured out the code and can provide a step-by-step guide for setting everything up.