ACSM download, DRM-stripping and uploading to Dropbox can be automated with a python script if you buy from the Kobo store. It requires Calibre, but you just need it for the CLI. Another python library is needed for automating the ACSM auth and download. KOReader's UI is awful, but once you get the hang of it, importing books from Dropbox to read on your Kindle device is pretty nice.