Comment This is precisely what the AWS API is for. (Score 5, Informative) 80
Because your workflow is likely to be customized to your tasks, it should be straightforward to write these kinds of tools yourself, with any number of available toolkits, based on what language you're most comfortable using.
There's the straight CLI: http://aws.amazon.com/cli/
And lots of sample code for the various SDKs: http://aws.amazon.com/code
Best to just dive in. If you have any development experience at all, even just scripting, you should be able to figure it out pretty quickly.