EnergyPlus idf or openstudio OSM to IES-VE, HVAC import

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I'm pretty sure that's not currently possible. Your best bet is probably something like this using the gbXML+ schema and IESVE import capability (although I haven't used that myself). You can't currently create HVAC systems in IESVE using the Python API, but you could create various space grouping schemes to expedite assignment to systems once you import them. You can also create/assign groups in a spreadsheet by copy/pasting in and out of the tabular space edit dialog which is likely faster if you're not a Python wiz.