Sure, it would take some time to make 100 holes but the advantages of them over depressions on the plate surface are obvious for all potential cases when such encrypted plate could be used.
The disadvantage being your plate no longer has a blank rear side, so cannot be bolted on to something "face down" to make it appear like any other metal bracket or joint.
I'm also not convinced that trying to line up your plate with a printed template and line up a powerful enough light with each hole to get a clear point projected on the template in the right place is going to be any easier than just doing as Loyce has suggested.