After reading Fire and Ice I thought about it. The list are well designed to split elemental casting up by element.
SCSM can remain the same with the kata being special effect. No Hnads means no motions, no voice remains silent casting. It could be fun to invent hand motions or vocalizations for casting, if your players are into it, or just for a one time display by the GM in game for entertainment purposes.
You will have to invent spells. I have seen the cartoon a few times and the movie, so I am no expert on the show. But I would want:
Push spells: by element, cause unbalance crits, step the spells (Air Blast I (A crit), Air Blast II (B crit), etc.
Binding spells: Chains of Light, Earth Shackles, etc. Design each grapple so it hinders but allows for escape by some means OR do grapple crits. RMCI has an awesome chains of light spell.
Elemental armors and movement spells.
I have to run...house work and gardens, sigh.