Yeah, using that in a combo is impossible (except in DOA1 as a bounce combo, but that's still a hard combo to get good damage out of).
I managed to trick people into getting hit with the kick a few times but it's more of a card you throw out once in a game and hope it pays off. However, when they do get hit on counter hit, they get launched really high.
Also, how many different ways can you pull off the TFBB? Usually I pull it off normally (easier on stick) and sometimes I buffer it after doing moves that leave me in a crouched state or WS. One really finicky and quick short cut I've found is to do 6314 and intentionally missing the 2 in the hcb motion. It's awkward, but it gives you a sort of instant WS while still keeping the 64 motion of the throw.
Again, this was the fastest shortcut I've found and it's actually not that good, so I'd rather hear how you pull off the throw.