The man wants MORE caster. How about this idea?

I really like this idea. It might make a nice side hustle for someone with the requisite skills and tools. Increased caster with OEM appearance for a price below aftermarket tubular UCAs.
there would be absolutely zero money in it (see below) and the amount of people interested in stock look + increased caster could be easily satiated with offset moog uppers. if you're looking for more than 3* it's likely you're beyond stock appearing rim & tire combo, anyway.
It wouldn’t be super difficult. You can see the jig that was used for the TransAm series modification, it’s pretty darn simple.

I’m just not sure it’d be worth it. Even with a nice jig and clean control arms you’re looking at a couple hours labor, plus welding supplies. Add 2-way shipping into that and to make any money at it the price wouldn’t be all that much less than a set of tubular arms, especially adding in the cost of new bushings and ball joints since those are included in a lot of the tubular replacements.

Plus you’d no doubt get some control arms sent that were pretty rough, so then you’d have to spend more time cleaning or even make the judgment call not to work on some of them because of their condition.

Not saying it’s impossible or anything, but I won’t be setting up to do it.
all of this.

my back of the barroom napkin maths breaks down thusly: 60 for UBJs, 90 for some offsets, let's say you score a set of arms at the yard for 100. so you're 250 into a set before: cleaning, modding, painting, listing, selling (answering dumb questions), and shipping.

if your profit aim is 10 bucks and a burrito, then, sure i suppose it's worth it. but same as 72, i'm not gearing up to do even stock arms when you can get them (if available) at $250-- even though who knows what balljoints or bushings are in the arm. because people see "NEW" and $250 so why would they want to buy a set of "reconditioned" arms from me for 300? they don't know or care about the balljoints or bushings. they just see a new piece they can snap right on the car and get on with choosing rims or a chrome aircleaner or whatever.