If you end high-gravity combos in b14~EX Smoke bomb, it's only escapable by tech-roll. But it happens so fast that people might not block it. If you are in dire need of the chip and are willing to risk it, GO FOR IT. This is probably the "fastest" setup that people will not be used to reacting to, so if they don't mash techroll by default you are nearly guaranteed to catch them at least once.
G'head and file this away in your shenanigans box.