Thank you everyone for your kind replies. After reading the wisdom here and much thought, I have decided to continue to "walk two paths", that is, to continue training with Org A at home and travelling to train with both Org B and Org A. Perhaps the two paths will merge one day.

The dojo I train in, and which I have trained in since beginning Aikido, will forever be a part of me. The training I receive there is, and will continue to be, invaluable. A wonderful gift, as someone here has said. The members are like a second family to me. I don't believe I could bear parting them.

Perhaps one day, I will be able to begin giving back to both groups that which they have given me over many years, as I believe this is in the spirit of sensei's efforts (and also Jun's) of connecting the entire aikido community together through the organizational barriers that exist today.

Thank you all very much!