You might consider doing some training with Rev Koichi Barrish at the Tsubaki Grand Shrine of America. Aside from having a shrine / dojo that is probably the most beautiful dojo in the states, at least from what I have seen, he has a lot to say about the Founder's spiritual training and how it relates to Aikido.
Shrine Website
He is a very nice man and has a combination of Shinto and Aikido training that is unique. Very interesting fellow.