If you really need to make a mold for this for long term use, Use a DO IT blank mold and take it to a machine shop, they can knock this out in no time.
The DO IT molds are already hinged, and have nice handles. For something like this they can either run a ball cutter horizontally, or even drill and then ream the cavities to size with the mold clamped together. The Reamer will give you a much nicer finish and the parts will release better. Aluminum galls easily if you dont use a cutting fluid like kerosene,so let a competent machinist do this for you.
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