RCBS makes the primer pocket brushes, and they are usually in stock most places.
The uniformer is not a one time use tool pr case, because if you do uniform your primer pockets to get consistent depth it will after a few firings have become inconsistent again, the primer pockets are affected by brass flow just as the rest of the case.
This problem is most apparent the few first firings before the brass gets work hardened.
I use 21 st century shooting uniformers that i set up for each caliber i reload, using it with a power tool for a clean up cut after the depth is set does not give any problems, i do only use one type of brass for each caliber though.
It will of course also clean any remaining crud out of your pockets, but i tumble in SS media so the pockets gets cleaned.
Besides i don't like crudding up my cutters, new carbide inserts are'nt cheap.