Write a companion app for Apple Watch
This would fill a huge void in the Apple Watch app store. There are no OPML-savvy apps, and in fact no decent list processors at all: Evernote, Things, Omnifocus, Todoloo, Clear… don't qualify.
Yes, I would definitely use the Apple Watch App for the CarbonFin Outliner.
Bob Schraeder commented
I use CF for keeping all sorts of lists -- id love to have it on the watch!!!