using \input with the beamer option "ignorenonframetext"

[Mike Charleston]

I have a complex set of files that I want to \input in my Beamer
presentation for lecture notes.
I also want to make an "article" version that will contain all the
slides' content as well as interspersed comments. The problem is that
using the ignorenonframetext option means commands like "\input{foo}"
are ignored too.
I know there's a workaround using
\mode<all>
\input{foo}
\mode*

but doing that throughout is a real pain. Surely there's a better way
(wishing to avoid a bad hack of beamer.sty itself)?
Suggestions welcome.