I made both on a bridgeport using 1/4" BB, as well as jigs to hold the blanks for edge routing (round over, final size) and a screw hole locator. A milling machine make short work of it if you have access to that. I think it took me 20 minutes per? I've never seen commercial templates, did you check Rockler? Or wood workers supply? Seems like the kind of thing they might just have, never recall seeing such a thing though. I assume you are making plug covers and not burying boxes behind raised panels?