Bumpstop brackets are done and turned out well enough for the constraints I'm working with and for not having to weld anything more. You'll have to wait until next weekend for pictures and a description of that.
A couple weekends actually, but my week long break from work to work on the Blazer is over, now.
Some half inch aluminum plate later and I made a pair of bolt on bumpstop brackets.
It's a close fit to the knuckle, but just enough room. The triangle shape indexes perfectly into the control arm between the welds to the tubes.
Had to drill 3 holes in the control arm, 2 for mounting and one to clear the stud on the bumpstop, so I made the third large enough to fit the socket over the nut. If I had been thinking about the thickness of the control arm plate before I clearance drilled it I could have tapped the holes instead. Or vice versa on the bracket. Just an FYI for anyone looking to mimic this in the future.
Touches off on the outside of the spring pocket like so. I'm hoping I'm not riding on these often, but not sure how the longevity will be with what Ryo has experienced before.
I can space these up or shave them down easily enough to adjust the bumpstop height, but my best guess for now seems to be spot on.
Both arms are welded and at the powdercoater now.