should be easy enough to drill then, brass is a pretty soft metal easiest way for a diyer would probablly be to screw the plate face down to a block of scrap wood, made dents with a puch to guide the drill and then drill it with a normal hand held drill and a HSS bit.
since the plate is metal make sure whatever sockets you buy have built in plastic peices to isolate them from the plate they are mounted on.
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