Update: So after a few phone calls and talking to people at the machine shop, I have decided to go ahead with my original idea of drilling the ten holes. It will be a bit costly (about $150) and time consuming to set up everything but I think it will be for the better.
I had found several other studs with the correct knurl diameter but those would require me purchase another set of lug nuts as they are of a different thread size and pitch. The price of this option would be under $100 including the new lug nuts but seems to be too much hassle.
The other option I had was to use studs for another Mazda (I don't remember which one) but that would require me to purchase 3 sets of studs (They are sold in packs of 4). These would have the desired total length and 12x1.5 thread but the price for three sets ($120) would bring me close to price for drilling new holes.
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