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First make a copy of your site, there is an easy way :)
With one of the copies, go to find/replace and select entire site if thats all you want to edit and check the "use regular expressions" box.
Put this in the find box
<!-- #BeginTemplate ".*" -->
The only edit from your code is the .* bit, which is supposed to match any character, i.e. the filename to your template which will be different each time....the regular expression matches them all.