Have you considered rebuilding it with something
responsive - PageLines or Responsive theme? It might be easier just to
start there and then rebuild the styles of the current website.
We have considered using an already existing responsive theme in
general, without any specific examples (option #2 in the Bugzilla bug);
I guess that those two templates might be good starting points (our
currently theme is based on the Twenty Ten ten, too) — so if you are
interested in helping us, or know someone who is, feel free :-)