Thanks for the kind responses!
I have looked at the hub dynamos and I am just not sure if I can justify the increased drag for the power. The drag would make it about 15% harder to pedal in order to power the system. It is not out of the question though.
There are some more features that I am working on, and should have them added in the next two months (really busy with some other projects unfortunately). I won't dive into details, because I want to ensure that they work first.