Please follow the steps given below:
4. than select the shortcut key you want, Category: Edit, Function: Links (there are two, the first one works for me)
And, just curious, what requires you to use Edit > Links so often? I almost never touch it. Maybe pasting a lot of stuff from the Internet?
If you're looking for a shortcut that just breaks all the links, then yes, I don't see that anywhere. I think it would require some macro coding.