I was wondering if any NSP or NAP still supports the requirement to carry OSI/CLNP traffic.

NAPs can be proposed to be implemented as LANs or MANs or other innovative approaches. NAPs must operate at speeds commensurate with the speeds of attached networks and must be upgradable as required by demand, usage, and Program goals. NAPs must support the switching of IP (Internet Protocol) and CLNP (ConnectionLess Networking Protocol) packets

I think this is a legacy, aka obsolete, requirement. But some folks with checklists insist you can't be a NSP or NAP if you don't support it.