Hey Peter -
While I agree that the IPSCO e-brake bracket is pretty (very) slick, we were able to make an extension to the stock bracket. Handbrake Bracket on 5357
We just extended the stock brace with a bit of scrap. We used riv-nuts on both sides of the frame to provide solid attachment points.
Not as super as the IPSCO option, but certainly something your metal guy (or yourself) can fabricate up.
PS> If you are interested, and monkeying around with the bracket, you might consider this mod as well. Let us know if it works! Link to Historical Handbrake Article
I assume your bracket should be very rigid to do this.