The man wants MORE caster. How about this idea?

inertia said
If you're going to this trouble, we just chopsawed the end of the control arm off, weld a flat plate with a 4 bolt chev joint thru it.
Support and gusset as nec.
It'll look fabbed, be strong as hell, and ball joint attitude is totally up to you.
Just saying, - that's what we did a lotta times.
Click to expand...

Exactly, that would be the way to do it. Add a plate like this
https://www.speedwaymotors.com/Upper-A-Arm-Ball-Joint-Plate-Only,39783.html

Screenshot 2024-02-12 at 12.39.00 PM.png

End up with something like this but plated into the stock UCA instead of tubular. And no worries about stripping ball joint mounting threads in the UCA.
Screenshot 2024-02-12 at 12.39.58 PM.png