Perhaps it would be worth contacting both developers to see what their plans are in terms of licensing and availability.
I agree that there are a limited number of people in the Delphi community capable of handling such a project, although an ActiveX component should work equally as well. Unfortunately, I haven't found anything in that area either. My guess is that people have underestimated the demand.
Perhaps if there is enough interest, we should consider pooling resources and creating a project opportunity.
Before I forget, this is another application that uses AGG as its rendering engine:
http://www.creativedocs.netI've inquired about the possibility of a library but the author mentioned he hadn't considered it yet.