if you sent this model out to a machineshop, then very understable they turned you down..
the reason is, because those details might require sinkeroding work...
also only my opinion, you need a shop that producing stamps, like letters and similar.. they know effective ways to dealing with details like on the picture.
a general machine shop will turn it down because without sinkeroding equipment this part requires a 5 axis machine,,
and tooling for the details something like engraving bits..
in steel, this work might takes hundreds of hours due to using engraving bits...
when machine shop said they """can not do it""" , then try to imagine, if they bill out to you a bill about 15K due to the necessary time ...
I think the best offer for you, would be buying a machine like the neogroup selling and fabricate yourself..
click this link to the neogroup website...
Hardware - NeoGroup Limited
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and a website for this type work..
SOSSNER ROLL-A-MATIC: Solid Engraved Marking Tools