A trimmer should be able to help you out, I recently tore the leather
on my car seat with a broken zip on the back of my jeans. To retrim
with a new cover was going to cost =A3700
and I ended up getting it fixed for =A360. The repair was very good,
only slight problem was that it was a special cocoa brown leather with
black flecks in and the repair was done and painted brown, it really
hardly notices though. I'm not sure exactly how they did it but the
damage is invisible.

HTH

Cheers

Richard