The man wants MORE caster. How about this idea?
Maybe you've never heard of "Tolerance stack up" ?
In most cases, all of the acceptable tolerances balance each other out. A frame rail could be slightly shorter on one side, slightly longer on the other, the K member could have its LCA pin further to centerline on one side and further away on the other, etc.
A car that was somehow built with all of those tolerances
to the good can happen. My Charger has been aligned with more caster than any other stock Mopar I've owned even before using the offset bushings.
This car though...
I tried aligning it twice. During reassembly, i set the alignment cams set full outward in front, inward in rear for maximum caster and after they messed with it, it barely got 1 degree. The offset bushings were able to allow just over 2 degrees. It steered okay but wasn't good enough.
I'm the guy that loves to try things on the cheap. I like the idea of making stuff work better with little changes.