I didn’t mean to imply that pianoing worked; it doesn’t. I only meant that pressing a different button immediately before (almost simultaneously with) the punch button you want to tap seems to help get the hands out. And you only need to press whatever punch button strength you want 5 times.
For combos, Honda doesn’t really depend on comboing. Jumping fierce, close standing jab xx headbutt isn’t really that hard. Honda’s headbutt requires very little actual charge time, so you can just jump and start holding back and you’ll be good. That said, it’s easier to do jumping fierce, crouching short xx headbutt, just because it’s easier to link and then cancel into and from crouching short. Other cool combos include crossup forward splash, standing jab, crouching short xx headbutt and after fierce grab, walk forward, crouching short xx headbutt. But again, comboing isn’t real important for Honda.