Alamy's insistence of a three tier key wording system is a total pain and a burden to contributors -especially when brutal time has already been taken to apply comprehensive IPTC. I hate doing the same work twice.
The only method that works for me; I make sure I 'always' put the most important keyword first, players name, etc.
I use as much of Alamy's batch processing as I can but not for keywords as they vary from image to image. I use keyboard shortcuts to copy and paste keywords, also using only keyboard shortcuts to shuffle between the three keyword panels to paste, etc, however, it's still a laborious process.
Lightroom plug-in (not for me)
http://www.lightroom-plugins.com/AlamyIndex.phpThe CEO of Alamy recently announced they are in the process of making uploading images less hassle - long overdue!
Submitting images to Corbis re keywords (provided understanding their dislikes) is a breeze in comparison to Alamy.