Cool! Thanks for sharing.
This is basically the same approach I had in mind, though I did it a little bit differently. This was what I struggled with:
Since you can't re-home existing devices if you discovered this issue after the fact, and because I figured that an additional app should be optional for people that didn't need it, I went with user-selection of existing devices rather than having the app parent them.
UPDATE: new info on app is here - Image Server app for dashboard images and notifications
Previous location:
You just have to form the URL for any dashboard images to include the DNI of the device of interest, but the app shows the URLs for each selected device to help facilitate copy/paste during dashboard creation. Note that this should be used for the Image URL, not the Background Image Link or else the dashboard auto-refresh won't work.
EDIT: @b491ce02c78ba874857b just making sure you saw the last two posts of chatter on this topic, as it wasn't a direct follow-up to your previous question.
