It should just be a get drafts from workspace action, followed by a repeat with each item on each of the drafts to get the draft ‘objects’. Within the repeat, use an append to Evernote action utilising the content of the draft being processed by the loop (use the repeat item variable, set as a draft, and specifically to the content). In the same loop, I would also consider moving the draft to say the archive so that it would not get processed multiple times in succession should you not manually intervene.
Something like this perhaps.
Your device would need to be unlocked to do this. Therefore, I would consider just having a reminder pop-up with a link to run an action within Drafts to do the processing and sending to Evernote. It should run more quickly that way as it would not be switching between apps, and so be less disruptive to you.