Re: Aikido in Schools
You're unlikely to find any sort of religion/spirituality in public schools in the US. That would fall under state promotion of a particular religion, which is strictly verboten. (Or at least adherents of other religions would see it that way, regardless of the actual content of the class.)
The only way to get something like that into the curriculum would be as literature, as anthropology, or as comparative religion, and all of those are much more college-level than high school-level topics.