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You don't need NAT for that, you can just use ULA:s within your LAN and GUA:s for global communication.

I am a network engineer who understands what those acronyms mean, and what you're describing is an order of magnitude more complicated and more work for the average use case in a large corporate environment, a small business environment, or a home network environment.

This is not simply architecture astronomy, it's the equivalent of planning an expedition to a planet to plant a flag with a title granted by the "International Star Registry"

I genuinely have no idea what you are talking about. Having the router advertise two kinds of subnet (one local and one global) is no more complicated than setting up NAT66. It's actually likely easier because it's likely something that can just be enabled with a simple setting, if it's not enabled by default, while NAT66 will probably require more intricate configuration, if it's even possible at all.

Not sure what the second paragraph is supposed to mean.

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