QPRCRTPG and allowed op-codes -- MI400

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Back in the S/38 days we had a MI "compiler" from a company
named SoftCommand. Does anyone here know what technique 
(undocumented API?) they used to create MI programs.

Is there any other way than QPRCRTPG to create MI programs,
and would it be possible to use all the available MI opcodes?

Would it be possible to write a MI compiler that used a pre-processor
to substitute all "illegal" op-codes by valid ones in such a way
that they used the same arguments, and then patched the compiled
program with the correct instruction hex codes before completing
the "compile task"?




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