Thank you Scott,
I've been traveling down this path to ArcGIS Portal already, and it seems to a longer journey than I was originally prepared for. It quickly led me to also using a Web Adapter. At first I thought they were 3rd party downloads, but now I'm thinking they are options to an ArcGIS Server instance.
For the short term, it seems that publishing our content to AGOL is more expedient, even though it's a round trip to SoCal for the data. (I don't see how to mark your response as an answer, but it did indeed, although I'm surprised at the answer!)