I think an Eldritch Knight build of some sort would best be able to use these. And, initially, I think a Tiefling 18Sorc/2Monk Eldritch Knight would normally make the most sense.
My problem (and it's a BIG problem) is no CHA to Damage.
I suppose I could go Wiz18/Monk2 (easy to get INT to Damage via Harper Agent) but the races that give the most Fire Spell Power (Tiefling and Dragonborn) are +CHA races, not +INT races.
Any help with finding CHA to Damage? I know PDK gives that, but only for certain weapons. Kama is NOT one of those weapons.
NOTE: I did consider an Aasimar 20 Monk, but Henshin Mystic only seems worth trying while wielding a Q-Staff.