You can ask the PBGC to assign you as the Filing Coordinator. I did this a couple of weeks ago, and it was painless. My situation was a little different, though. I was already the actuary but not the Filing Coordinator. The Filing Coordinator left the TPA firm, so there was no one to manage the roles. I sent the PBGC a quick email via My PAA explaining the situation, and they updated it within a few days.