What can I do to get people to accept better hammers?

Well, hey -- like anything, you have to sell it. You start with the benefits to them, just like a salesperson, and end with that little ol' teensy tiny thing they actually have to do.

Of course, no amount of selling is going to move refrigerators inside the Arctic Circle -- if the proposed tool-users find it to be "threatening" as people often find change, then you won't have buyers.
-----------------------
You are what you think.