Missing Template handler w/o Admin Access?

I know we can create custom error messages / templates for general processing errors etc, but is there some type of magic template that can be used to show if a CFM file is missing altogether? or maybe an undocumented function to assign it?

I know we can do this inside CF Admin itself (missing template handler), but we don't have access to that on the shared server the client is using.

The standard/custom 404 files only get triggered by non-CFM pages, so we can't use them either.

Any ideas?

Thanks in advance.