Instead of any treatment with so-called wood preservatives and other
more or less dangerous methods, we (and quite a lot of other museums)
use nitrogen.  Our restorers have an airtight plastic tent which is
held continuously under light pressure by nitrogen.  After six weeks all
living animals including eggs are dead, without any chemical residue.
Look for a museum or other institution where you can park your
instrument for six weeks in their tent.

For a view of a giant roof with woodworm and PCP which has to be
removed just see on: http://augustiner.regio-webcam.de/

Our roof will be completely removed after 300 years or so.  It once
was treated with chemicals but it still had woodworm and will now be
detoxified, repaired and rebuilt.  The timber-work is too big for
a nitrogen tent.  It will be treated with heat, which would not be
suitable for more delicate works of wood.

Kind regards,
Gerhard Dangel
Augustinermuseum, Freiburg, Germany
http://www.museen.freiburg.de/
http://www.welte-mignon.de