I’m trying to do something similar with Hazel (keeping only the last archive of the day)–would love to see your workflow.
I use Hazel to copy newly (and legally!) downloaded eBooks, photos, and music from my MBP to the appropriate family media server locations after I have cleaned up metadata.
I use this feature extensively! Any statement or bill that hits my download folder gets scanned by Hazel, renamed, and added to DT Global Inbox where I can have some Smart Rules do further processing and filing–there are likely ways to do this all in DT, but some of these workflows pre-date my switch from EN to DT and they just work.
I also use Hazel to run Zowie every time I add a new reference to Zotero to make it easier to work with journal articles in both Zotero and DT.