I was actually pointing out using Heavy Samurai Army instead of Normal Samurai Armor for the Sohei. The No-Daishi is just a cooler weapon, but the use of Heavy Samurai Armor would further emphasis the more defensive nature of the Sohei over the Yamabushi.
I agree that the Sohei should be made to 'recruit anywhere', if wikipedia is to be believed. I think that the Yamabushi
http://en.wikipedia.org/wiki/Yamabushi should get some supernatural powers. Mountain Survival would fit with them.
Anyway, there are a lost of different ways that the Jomon could be altered.