Tied grace chords

[Chris Jackson]

In piano music it's common to have a 'grace' chord in one hand, tied
over to a wider-spanning chord in both hands, like so:

\score {
\notes \relative c' {
\grace {<c16 g'>} {<c1 g' c ees g c>}
}
}

But I'd like to make ties between the C's and G's here. Is this actually
possible using \grace ? 
 
I realise there might be a hideous solution like so:

\score {
\notes \relative c' {
%% artificial grace note
\property Thread.NoteHead \override #'font-relative-size = #-2
\property Voice.Stem \override #'flag-style = #"grace"
<c16 g'>~
\property Thread.NoteHead \revert #'font-relative-size
<c1 g' c ees g c>
}
}

and putting the bar in an isolated context so the bar lines aren't
shifted out of sync. Or maybe there's a property to set to make the
artificial grace note have zero length? Although it's still not
pretty..

-- 
chris