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Those guys are basically just cutting up the stock knuckles and rewelding them with the arms that the tie rods bolt up to being shorter and with a "flatter" angle, thus allowing the knuckles to be able to spin around more before they touch the FLCA as the tie rods pull them in.
Because of that, there is just not enough material to cut up and reweld on the back side where the FLCAs would bolt up to, thus not able to add any roll center correction in that sense.
To correct roll center with stock or stock-like knuckles, the most cost effective way to do it would be to do what Def did and modify Godpseed FLCAs and do it up that way.
Or you could take out the stock ball joints in your stock FLCAs and weld in spherical bearing cups and put spherical bearings there, then use a 3/4" bolt in place of the ball joint or the tapered stud. Makes life a million times easier.
Then all you'd have to worry about at that point would be the tie rod ends.
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