Is there, by chance, an easy way to implement such a thing? Because I'm planning to redesign my site too and rewriting even 75 pages is too much work if I can help it.
Well, installing a local copy of PHP, writing up a template of how you want the new pages, and telling it to grab the current target and inputs from $argv or $argc, so you can run it from the command line (see
http://www.php.net/manual/en/features.commandline.php).
If you're using a *NIX OS or Cygwin (a *NIX emulator for Windows), you can then write up a script for Bash (or, if you don't have those around, another PHP script) to iterate over each target file/set of inputs, and execute the first script, passing them as command line arguments.
Yeah, it may sound like a lot of work, but in some cases, it's easier than rewriting 75 pages of stuff.