perforation

Hi. I need to make a sheet metal part with "perforations" on the bend lines so I can manually bend/ fold it. found a few discussions on it but not really an answer... I cant seem to make this work on the preview of the flat pattern, as it doesn"t seem to accept dteh geometry for an extrude (only if its within flat sections…

I considered using points along with circular and linear repeats to create a hole pattern such as one used in a speaker grille or shower head. But when I select them the hole feature fails due to too many (> 100) holes. Short of painstakingly selecting < 100 and repeating the process until all are done, is there a better…