If the Kobo browser is good enough, you can aim it at the Kindle Cloud Reader
http://read.amazon.com
If you haven't used the browser before, it will require a trip through the settings:
https://www.youtube.com/watch?v=jUBJYdl_mMk
Your milleage will vary but I did it on my XBOX and it worked fine.
It should be somewhat simpler than installing Calibre, tracking down the deDRM tools, installing those and processing the books.
Good luck.