Or just wants an honest opinion?
Personally I wouldnt do it (another engineer) but assuming you can clear the locating hole for the disc and the other 4 existing holes it "should" be OK. They are drilled to start with and fancy drilled discs are far more prone to cracking (yet hardly ever fail completely), plus you do have the wheel clamping the disc which should prevent excess stress concentrations around the wheel bolt holes but as I say, I wouldnt choose to do it.