Epicor was kind of built to work with WorkStation / Printer and BarTender. It wasn’t built to support a Client just printing to a Printer.
If they just made the SSRS Printers available, the CSV Output is there.
Epicor does trigger a BPM when it Submits it with the Client Details to the Agent, you could always intercept and populate the Workstation Assigned Printer and have the same Logic that Auto-Print Widget has.
Ice.SysTask.Update PRE-Processing should allow you to do something like.
Please Note this is really high-level, one should perhaps look-up to make sure the ReportStyle is BarTender, and only look for Certain Styles in order not to interfere with other reports
What that gives me is:
You would just need to do alot more code to find the context workstation, lookup a Printer etc…
One thing we did in the past is if I recall made a BPMForm that has a dropdown with SSRS Printers and lets you select one and it passes it thru to the BPM.