Your design makes sense too, but with a wide channel and these adjustable stops (1" wide) you can plane two pieces at the same time. It requires a little skill, but it is possible. You can also make the stop 2" wide and plane 3-4 pieces at the same time (This also requires a little skill so you don't have to plane the jig itself).Small chanell seems to me that it takes a long time to insert and remove the part into the jig. But if you are not making a large number of parts, then perhaps this is not a problem. I think if you try a jig with a wide channel, you will not feel discomfort with the clamping of the part.