Update: I've received word from a man who knows, and it ends up you don't have to re-run batch resave if you're moving your libraries around. Here's the info;
"The only time a batch resave is needed is when you move the library from Mac to Windows and vice versa. Consequently, every time the library gets an update, which overwrites the NKI files.
If you just move a library to another hard drive on the same system, you do not need to batch resave at all - the paths are all relative, not absolute, so there's no need to relink it. HOWEVER, in case of non-Kontakt Player libraries, you WILL have to find missing samples in all the DAW projects you have that use that or those particular non-KP library/libraries."
Great news, and I hope it saves other users some time.