Know that experience too well, I even resorted to putting my bars in the freezer in an attempt to make them microscopically smaller. The fact the DA quill stem isn't split at the bar clamp so can't be prized open with the coin/bolt trick doesn't help.
I've got a silver 42cm pair of Soma Highway 1s as the answer to the post above yours was that they don't fit in a DA stem!
Some scratches from attempted insertion but nothing bad and nothing that would be visible.