I kept them on, and just do the convexing about 1.5" - 2" above where the back plate stops. I found it a pain in the "derrier" having to take it on and off, for when I'm playing with my woodworking.

So, I fiddled around, and found that by staying above the back plate, you can still get the convex edge, and it's not hard on the belt (Although I found I had to take a file to the lip of the top portion of the back plate, to remove an edge that would've caused problems.)