Here is a link to a Bosch/Rexroth E/P pressure regulator. I have used several of these in the past and have always had good luck with them, as long as you have a CLEAN, DRY air supply.
There are ones that have a max input pressure of 10 bar, as well as 11 bar. Input pressure rating of 10 bar SHOULD do it, but I would go with a max input pressure of 11 bar.
Correction: I thought there was one with a max input pressure of 10 bar. After double-checking, I see that they jump from 8 bar to 11 bar.