You can always put the brass on the break. However, I have seen repairs to broken wrists where a slot was milled into the stock across the break. Then a piece of strong wood approximately 1/2" thick about 3/4" high and long enough to anchor in solid wood on both sides of the break was epoxied into the slot. Sort of like one of the biscuit joints use to join boards on edge to make table or furniture tops. If you did this from the bottom of the wrist, with wood similar to your stock there would actually be some real structural strength added to the wrist. If you want the brass, it will now have some solid base material carrying most of the load. Since you don't have a working glue joint now, this would give you a good glue joint on three sides of the "biscuit".
Just a thought. I have seen this done on a classic English very high dollar shotgun stock and it is solid as can be, totally invisible.