>
> \setuphead[chapter,section,subsection][number=no,placehead=no]
>

Outstanding.  The only problem that I have now is that issuing

\chapther{Foo}

immediately before

\copypages[path/to/file.pdf]

forces a new (blank) page before the external page is inserted.  Without
the \chapter{Foo} command, this new page is not inserted.

Troy