CHa to ac, huh? Throw in some monk 1-2 and bard 4 for Ascetic Mage to get CHA to AC twice, and snowflake wardance for CHA to hit if you don't plant to TWF. Paladin 2 for CHA to saves too. OA samurai 1 -> Iaijutsu Master 5 for CHA to damage, or it OA is no go, Divine power for CHA to damage- you'll need 4 levels of paladin or the turning. etc, etc.
I love CHA synergy.