I made a Python script that tries to automate removing your Twitter followers.
https://github.com/popey/twitter-defollower
I started running this yesterday, and I've gone from ~17K followers to ~8K overnight. So that works! :D
It'll be zero by the weekend.
@popey I saw this post before remembering what you were trying to do yesterday, and my response was "Wow, people really don't like your exercise goals"