Like a few others have pointed out, the effect is almost incomprehensible without patter. However, even with your patter, the whole thing isn't totally clear.
Of course, I understood what was going on because I had already seen the patterless version, so I knew where to pay attention, but laymen might not appreciate the fact that the effect is a transposition and a reverse combined. They might just think you reversed the 2 of hearts, and that the four of clubs was just distraction.
So, in this case at least, the patter makes a small improvement, but the effect itself might fail.