You can do it like you said, glue some tapered lams to a board... or have a board ground to the taper you need. Mine is a little more complex, an adjustable sled of aluminum.
To keep the lams from slipping, I put 3m Safety Walk anti slip tread tape on my sled. It's adhesive backed and comes in different sizes. I used 4x24" and butted two together to cover my sled. I works well. You could also stick some rough sandpaper on there.