Hey Morgan,
I’m skeptical about making your process automatic.
There’s no built-in API that announces when an import has occurred, so you’d have to kludge something – and I think the chances of fouling up your data is too great.
I think you can probably use a little AppleScript to work with the Last Import Album to manually do what you want.
Take a look at this thread to get an idea of what can be done:
Editing images inside ‘Photos.app for OS X’ using Photoshop
How are you accessing your Amazon Photo Drive?
-Chris