It seems you may have your answer.I, too, am hoping for some integration here, (forward-looking, though) but I interpret no answer as "no plans." Hopefully something has changed since your post, or it was simply overlooked.

I'm using a Nexus9K, and according to this document it's now possible to filter SNMPv3 requests via ACL? https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/6-x/system_management/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_...