Ooh, thanks for the 2012 link to the same question.
I love this idea (
http://www.guitarforum.co.za/setup-mods-and-repair/where-to-find-a-fret-crowning-file/msg184269/#msg184269)
I think I'm going to try this first. I only have 1 fret that is ever so slightly high. If this method fails, I might start a group buy ?