I have searched the forums and know there is currently no functionality in the UI that allows me to change the organization key. I have also seen numerous requests get solved via private discussion, so there is a way for the key to be changed, but by support/ops folks.
As with many others, our organization key made sense for a while, but then things changed, and we need it to be updated. I am aware that all integrations will need to be updated, and I am prepared to handle that. 
Someone from SonarSource please contact me privately for the details.
Thanks!