Changing 40 projects manually one by one will take you 60-70 minutes (estimated).
You could probably write a TinyXML-based application which selectively replaces that one one node (in the respective target) in less than 10 minutes. That would be a lot faster, less annoying, and just as safe.
If there is a lot of work that is outright annoying and stupid like this, then I always say "Hey, what do I have a computer for!"