I found a bike shop with a really great welder who was able to re-create the missing piece on the end of my swing arm. I also had him cut off the old, mangled chain guard brackets.
I was able to grind out most of the rubber in the swingarm bushes with a hole saw, then fabricated a puller to remove the inner bushes together with the remnants of the spindle.
Still working on the outer bushes. Hoping to get this thing to the powder coating shop soon.