I think styles could be implemented now that techniques have been extracted from clan schools. A style would be a specific set of kenjutsu techniques, known and taught throughout the Empire. Clan specifics could add on top.
" let's confront your Crane battojutsu to my Scorpion Shinkage style. "
so base samurai could learn the Shinkage style techniques from any Shinkage sensei, and truly talented characters(like PCs) from a clan would also be able to learn clan specifics Shinkage from a clan sensei. See I always felt weird to imagine that every samurai was trained by clan school. In most of my games, nameless npcs and weak or unimportant NPCs have no school.
Not every Tokugawa samurai was trained by the Yagyu in Shinkage style. Only the shogun and close family.
always wondered with old editions how come in 1000 years no one has invented a universal kenjutsu style.