On The Pixie 14 the setup is with a wire. I'm maybe stupid like h.. but I hade tought that the dolphinstriker was there to take the downward forces (compression) that will occure in the mast, and then to my simple thinking the underside of the beam is taking more and you need less cross section in the strap if you don't drill a 25mm hole in it. It's also stupid in my opinion to drill a hole in the strap, because you have to use a bigger cross section, to compensate the loss of material or can that also be canceled?
I'm going with Florin, there is no need to add more weight than needed.