@Doug Harrigan​ Thanks for your question! @Prabakar Ammeappin​ linked above to our Docs page that mentions a bit more about the recent (April) version update/change:

"This release fixes an issue that removed the Swap cluster button from the Databricks jobs user interface when the assigned cluster is unavailable. You can now assign a new cluster to a job in the UI when the configured cluster is unavailable, for example, because of a network change."

I am not sure that entirely answers your "methodology" question above, but let us know! Hope to hear back soon.