There may be another way but it looks to me that you could pop off the dial with a few smacks from a hammer and chisel remove the bezil two screws and the use a cordless drill and drill off the lock.......for me with colbalt drill bits maybe fifteen minutes.
You might watch this first as it may still have the factory combination.
Hartcreek, that procedure activates the relocker which locks up the safe for good. I have the safe open, and can access the back of the lock. I just don't know the combo.
I think I will just buy a combination change key and start over with a custom combination.