Brass is my favourite material. Perfect i would say. Drills, machines,taps like a charm.

Probably 60 degree V cutter will do it best. Now the great thing is that you could grind away the point, measure it and enter its tip size at the program. Voilaa, no need for tool change and avoiding complications. So instead of scratching the point on a V carve path, you will finish the flat space much faster.
Especially if you CAM could not combine properly V carve paths with pocket paths later. Which by the way is not so simple at all as it seems if the result must be perfect. Impossible by not electronically setting the tool height by probing in mach 3. Even then... The problem being not knowing the exact sharp V cutter tip size. If using non brand cutter, especially.

My advice- simplicity. Roughen if possible with bigger tool. Use flat tip V cutter and finish directly. No complications, if a bit more time. Bonus- no tip breakage, faster, simpler.