If it was me I would be thinking of using an endmill with inserts,it would be faster to replace inserts and be running again instead of changing an endmill out becouse it went dull.If you were to lay the part horizontal you should be able to do quite a few parts on a corner,iscar makes some nice mills for this down to .375 I think,we have some for putting 1.1 deep slots in mild steel and the tools last a long time.If you have machine capeable of high rpm's you can blase through it, we take .060 doc at 75 ipm 6500 rpm.
Just push the button,what's the worst that could happen.