Probably wouldn't be that hard to find hubs to fit your spindles and switch them over that way. I don't know how much experience you have fixing stuff I'll share a few thoughts-drilling or reaming them for studs sounds like a sound idea but getting the new larger holes exactly where they are supposed to be could be difficult,if they're a bit off your wheel may not be centered and it's going to hop when you pull it at any speed, this might be a job for a machine shop and someone still has to figure out if the hub has enough meat to bore out the stud holes and not get weakened in the process. Bolts through from the backside may have merits, just make sure the bolts you use are as good or better than wheel studs or lug bolts or you could have wheels flying off, there's never a good time for that. I guess I'm saying the safest way is new hubs, from there it's your wagon, you know how much weight you haul, how fast and far you pull it, how much your cargo is worth, how much you have to loose if the patched hub fails and injures someone and your risk tolerance.
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