Assuming that your suspension bushings and joints are “good”.
One option is aftermarket control arms, that add a preset amount (typically ~3*) of caster (Nitro, Trail Tailor, Dobinsons, Total Chaos, etc), or are adjustable (SPC) and allow you to adjust camber & caster beyond the factory adjustment.
Another option would be to reduce the amount of preload on the torsion bars (read as less lift in the front).
Before you get too involved with correcting the alignment, I would verify that you still have a “reasonable” (50-75mm) amount of droop, otherwise it will still “suck”, even with the correct alignment.
Some of the aftermarket UCAs that come to mind:
SPC $978.20
Specialty Products is the pioneer in the automotive alignment parts business and is the preferred brand by professional installers. Proven Quality, Performance Parts, Technical Training and Support.
www.spcalignment.com
Total Chaos $874.02
Toyota Land Cruiser 1998-2007 UPPER CONTROL ARMS - 100 SERIES LAND CRUISER
www.chaosfab.com
Nitro $866.24
Nitro Upper Control Arms Toyota Land Cruiser 100 Series
www.nitro-gear.com
Trail Tailor $719.00
Toyota Land Cruiser 100 Series 3 Degree fixed caster correction Currie machined joints - 2.5" OD full flex, no bind joints - rebuildable and greasable 4130 CrMo wall tube arms 4130 CrMo ball joint cups Sealed maintenance free tapered ball joints with 4140 CrMo ball stems and SAE 1045 forged...
www.trail-tailor.com
Dobinsons $640 (with ball joint installed)
Complete kit for both left and right hand side, includes new ball joints (not assembled), OE style rubber frame bushings (installed), and washers Has 3 degrees of caster built in, no adjustability or settings required Made from HSLA (High Strength Low Alloy) Steel, 5mm (0.2") wall thickness, and...
www.dobinsonsdirect.com
Freedom Off-Road $380
Front Upper Control Arm for
www.freedomoffroadusa.com