for that center break you could get a piece of rectangular aluminum or mild steel, cut it into (2) 4" strips, drill a hole on each end and use it as a brace for that break right in the center, drill corresponding holes on each side of the break and bolt it on. That will be stronger than trying to bond it back together, which you could apply also with some epoxy.
i'm poor I have always figured out ways to fix things if it is at all possible.
you can do whatever to it right there as nothing will be touching it.
with the inside being curved you could bend a couple washers the same angle and use a couple stand-offs or short sleeves, unless you can round off the bracing metal with some kind of tool for the inside. or just use a couple big bent washers on the inside I don't think it is critical area that will continue to come apart just needs to be braced to keep from wiggling at all.
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