However, when the Site Address and List Name are dynamic, it exposes an Item property (named that for no obvious reason) in which you can specify an object with Column/value pairs. I created a series of wrapped flows that would do the create/update via the SharePoint HTTP Request Action. The object of Column/value pairs was exactly what I wanted because I can build the object at runtime.
Anyway, I would have saved myself time had I known this, so I hope others benefit. Always one to find that silver lining. I learned a lot about doing stuff with SharePoint with HTTP. I now have a flow that can get Column info, for example. I'll extend it to do other stuff, sparing the caller a lot of the details.

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