Hi @Anonymous,
Ahh, unfortunately, the Keynote Text can not be scheduled in a model element schedule so you can not do what you want unless you add some manual process, similar to what you are doing already. Copy/Paste to an appropriate Identity Data Parameter which can be scheduled along with a Keynote. (Similar to what I showed.)
Keynote Text can be used in Keynote Legends. View >> Create >> Legend dropdown >> Keynote Legend.
This has been on the AUGI wishlist before, I reckon it would be nice to be able to schedule it at least so that once you update your Keynote .txt file, it would update in schedules which you created.
I generally try and populate my family Identity Data as complete as possible which is loaded into my default project templates and managed from there, the reason being that everything is schedulable in projects. I still use Keynotes in schedules, but not keynote text due to the limitations.
I hope this helps! 
Rudi Roux
MSc | Digital Engineering Manager
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