[Zope] How to convert Zope instance charset?

[Daniel Dekany]

I have a Zope instance that uses utf-8 for everything. Since
Python/Zope/etc practically doesn't support utf-8, I would like to
switch over to ISO-8859-2 (for everything). The problem is that this
instance is a fat site that is on-line for several months, so I have to
convert the strings stored inside the lot of already existing objects of
the ZODB. Any idea how to do it, like an already existing tool for it?

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Best regards,
 Daniel Dekany