Change flavour "on the fly", possible?

I want a way to change flavour "on the fly" as it were, can anyone
suggest a way of doing this?

I'll explain a bit more as there may be more than one way to get to
where I want.

What I want to do is get a printable version of a page without most of
the extras.  In my case I'm using the wgbwiki plugin and a plugin of
my own to get pages with a sidebar in which there's a hierachical
menu.  I want to be able to click on a link which will make the
sidebar disappear leaving the information part of the page to be
printed.

A 'flavour switch' would do this because the sidebar is generated by
the head template and thus a flavour with a 'do nothing' head template
would get what I want.

-- 
Chris Green

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