I have, somewhere, a dowel plate somewhat like the one in the video that I got from Garrett Wade when they had a retail store in Manhattan. It works OK, I only used dowel rods in it. The plate had conical holes in it with cuts made in the perimeter of the smaller exit holes so you wound up with a grooved dowel. My problem years ago was getting dowel holes to line up properly. Which led to much pounding to get parts to mate. If you have a drill press you could probably make one easy enough.