Your other option is to check around with a couple of local engineering places and see if any have a CNC turret punch that can be programmed to punch a piece of stainless sheet with the holes needed
The heating element manufacturer I used to work for did up some custom drip trays for one of the local hospitality fitout company with some really awesome perforated latticework on their giant turrent punch once
I'm sure if they had the punches small enough and you could draw something up in AutoCAD/sketchup/etc, someone could do something for you cheaper than a full sheet