Yeah it'* a scrapped idea. It'* too bad because these were free

sell them for profit

Better that an engineer speak to this, but you could probably do it. the bugger would be the fixture for the drill press or vertical mill bed. You'd have to have one that locates from the dead center point of the wheel, and will also have to rotate exactly 72*. The lug taper would have to precisely match the taper on the wheel.

Well, I technically am a mechanical engineer now but I'm lacking in the experience department.
Through googling, I was able to find some cone seat insterts 'Commonly used when redrilling wheels to change from one bolt pattern to another.'
They are on page 35 of this pdf.
They are relatively cheap and take care of the complicated machining too.

I just realized I kept writing 114.5 instead of 115. My mistake.

114.5 was mis-stated above as well. We're actually talking 114.3mm.