If you, or the wg, thinks this avenue is worth exploring, I can write a 2 page draft. I honestly believe that this entire issue can be solved outside of the IETF by the RIRs without introducing anything new/damaging in the IPv6 architecture.
ULA do not introduce a change to the IPv6 architecture. They are only another way of allocating global unicast addresses. Implementations will treat them like other types of global unicast addresses. Like other types of IPv6 global unicast addresses they may be routable or not.
Bob
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