I think most martial arts can be done as is with BRP. Want great grappling skills? But super strength with limitation "Grappling only", want to run on trees like Crouching Tiger Hidden Dragon? Buy limited flight, or super leap (or whatever equivalent is in BRP, dont have book right in front of me).
And so forth. Chi powers/ki powers are just variations of spells and or super powers with the emphasis being inner strength and discipline.
Heck you could even buy points of armour, state that its only against hadn to hand attacks and represents your super ability to parry, block and dodge.
Its all in how you describe your bonuses and limitations placed on skills, powers and abilities.
Later.