Hi Joel, I anticipate you've already come across some of the limitations that pathing reports offer. In short, You'll want to make some implementation changes in order to get this specific report.
I tried pulling the data you're looking for, and none of the capabilities (Reports & Analytics, Data Warehouse, Analysis Workspace, Ad Hoc Analysis) could get pathing based on when an event triggered. In order to get previous pages, it must have a page value to start with.
To work around this, you could make sure that all checkout pages are named the same; that way you can simply pull a previous page or previous page flow report to get the exact data you're looking for. You could also create a custom prop with pathing that structures the pages in such a way that allows you to collect this data as well.