I tried that a couple days ago, the 236B 214B 236B for a finisher on ground block strings, however, I don't know if my timing is off or what, but the 214B does not cleanly connect after the 236B meaning your opponent goes neutral after the block allowing them to pretty much do whatever. It is a real quick drop in pressure, but some opponents will take the opportunity.
If it does work for you, try going with 5C 5BB j.BC IAD j.C j.236C j.BC dj.BC j.236 for a bit of extra damage at the end of the 236B 214B 236B chain. Replace the simple j.BC j.BC Q. The other does a good amount of extra damage at the cost of 100% meter, but might be worth it.