Why can nobody do the CNC job I need?

[M250cnc]

There are 2 approaches for this, cut it in 2.5D with a ballnose, cut it in 3D with a flatnose.

3D can also be cut with a Ballnose or a Bullnose but i agree a lot of time will go into cutting.

A simple mold could be made "High Precision Of Course" where a casting resin could be added, then the mold is sealed then the mold is rotated until all the inner surfaces are covered and the resin hardens.

A similar principal is used to make Easter Eggs among other things.

Phil