FWIW, I've had some luck in welding up hub holes, machining the welds flat, then redrilling to other bolt patterns. The hubs are forgings so they gas-weld OK. Note that if you do this, you'll need TWO different spares- or forget about carrying one at all.
I've also had luck in TIG-welding holes in aluminum wheels shut and re-drilling. This is a little more complicated. And of course, the quality of the above welds are a limitation, so pick a good welder.
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