So long as products are arranged in classes, then this module works as a rough hack which was sufficient for my immediate needs.

Another option that wouldn't be too hard is to add an option when editing attributes, give the option to update all attributes for items in the same class that have the same attributes and as well as an option for the options.

I can see a use case where a user has a bunch of t-shirt class items, and has manually updated the prices on a few and wants only the items that have the same attributes/options as the item being edited (before the edit) to be updated with the new values. With the class solution, the T-shirts would have to be in separate t-shirt classes.