For the central flow issue, I have been looking at this (in my head) for some time:
blue: cutting wheel
orange: copper
As ya'll can see, the circular disk would leave a pointy pattern in an unfinished cut. If this was done from all four sides of the center, the result would be a "pointy pyramid", with 4 walls.
But I can't visualize it without some kind of 3D render (Utabintarbo?).
The original intent was to use an endmill, which would leave a completely different pattern in the middle.
The original idea had a perfectly square cut, which is not possible without some manual effort and/or special tools.
Without any feedback from the miller, I'm at a standstill on this issue.
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