On the spinning riv-nut in the swingarm ...
Can you not remove the end cap and chain adjuster block etc from that side of the swingarm and then reach inside with some longnose pliers or somesuch, to hold the back of the rivnut while you unscrew the bolt ?
Personally, before doing so I would give the top of the bolt a few sharp blows with a hammer and punch, to jar the threads and hopefully crack the corrosion.
Then I would soak it in penetrating oil for a day or so.
Another option would be to carefully grind off the bolt head with a Dremel or similar tool.
As the rivnut is already loose and spinning, it should then drop inside the swingarm (possibly with assistance from a small punch) and you can remove it via the open end.
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