Ok, I used an empty project and simply put the greenworks plugin into it, and then exported for node, put in the steam app id, and correct api.dll into package.nw and renamed the exe to nw.exe, then triple checked it. Unless I'm missing something their I can't identify which steps I missed, so I'm going to try to use an older nw installation with the earlier plugin now.
Edit: does anyone have a nw 0.10 download? I can't find it.