Re: Moving to Aikido
If you want to study aikido, first step would be to find a specific teacher you want to study with, that seems to have the kinds of skills you'd like to learnn and who you feel you can learn from.
I wouldn't assume you would get any credit for training in a different martial art, even if it feels like a similar one. It could happen, but you'd kind of have to go into things ready to start at the beginning. In any case, any 'skipping' ranks would be something up to your teacher's judgement.
I'm not clear if by curriculum you're talking about yourself as a teacher? Again, your own teacher might have a certain amount of discretion in who they allow to teach in their dojo, but basically, I would expect it to be many years before you'd be qualified to teach aikido.