Don't know if you have your answers but We have totally converted from an MVS Mainframe to SAS running on a windows server. Usage on mainframe was minimal 20-25 jobs and only a few of those were run daily as scheduled production jobs. Our approach was a bit different - jobs are submitted from mainframe using XPATH. XPATH runs a window batch file, all output is returned to mainframe logs.
From the users point of view - the only thing that changed was the job JCL. All code still resides are mainframe.
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