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You might consider an aluminum welder. For very little $, Chundy, another member here had a broken mount for his CB750's exhaust welded up, drilled and retapped. Similar situation, but no studs on the 750. The hole for the bolt was broken - they built it up with new aluminum, and I think ended up with a heli-coil in it too. He then put the bolt in and no trouble.
The solid threaded things I've used are "keenserts".They work very well if you have the room to install them, the outer threads are fairly large. I've never seen one fail like a helicoil will, although in severe use they wear out; these are commonly used as original parts on camera equipment etc. made of aluminum whaere mounting bolts are going to be used often. Aluminum threads wear quickly and are very easy to crossthread a steel bolt into.
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