i hav'nt received any response on this discussion.
I don't think an out of the box solution exists. You'll need to write some customization.
Not natively. You'll need to write an add-in. We thought about doing that but decided against it due to linking or pasting the ECO/ECN/ECR as a reference to the drawing. This will keep the drawing linked to the ECO's against it. It sounds like you're trying to save the cost of someone's job to automate it. IMHO, After what we have seen, I think you may end up spending more time trying to get it to work properly.