Keypoints-01-TinderboxExport
And this additional screencast demonstrates how custom key:value attributes can be added in a Keypoints note and how these get added as dedicated note attributes in Tinderbox:
Keypoints-01-TinderboxExport-KeyValueAttributes
Note that you can run the script with the same Keypoints note(s) multiple times, and the script will update the corresponding note(s) in Tinderbox if they exist already.
While not shown in the above screencasts, the script can also recreate cross-links between all exported notes as proper Tinderbox links:
Similar to the DEVONthink export, the Tinderbox export is performed via an AppleScript script which makes use of the scripting implementations of both apps. This allows for a fine-grained export that can be easily customised.