Anything on the roadmap for this limitation "You cannot reference the security group of a peer VPC that's in a different Region. Instead, use the CIDR block of the peer VPC."

Anything on the roadmap for this limitation "You cannot reference the security group of a peer VPC that's in a different Region. Instead, use the CIDR block of the peer VPC." https://docs.aws.amazon.com/vpc/latest/peering/vpc-peering-security-groups.html