Thanks to all. @IP-Man if I understand correctly, I create a new auto receptionist that is dedicated to just voicemail; that is, all calls to that new AR go straight to its mailbox. Then simply direct unanswered CAP calls to that AR? By looking at the settings that should work! Tiny bit kludgy, since we need to monitor both Main AR and the new AR's mailboxes, but in our case, most VMs will come from the new AR's mailbox anyway.
Thanks for this!