Hi,
> I was hoping there was some way to just copy the contents of {oldwampfiles}
> to the corresponding folders in the current install, and edit a configuration file
> for MySql to see them again. (Or add them back in as a batch.)
It will work with the files of your local sites and redeclaration VirtualHost, but it is absolutely not work with the file copy of MySQL databases. The only way to transfer databases between different versions of MySQL is the export / import with SQL files.
Well if you reread the link I gave you, you will see that if you still have the old Wamp folder, it is entirely possible to revive the old version of wamp.
And, once you have revived the old version, you can export your databases in a SQL file.
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons