DirectDrive
Observer
It is certainly possible to omit the aftermarket UCA's and see how it drives after the lift. Add it later if needed.You may not need upper control arms either, I started with about 2.5" of lift and did NOT need aftermarket upper control arms, YMMV.
Out of a ton of samplings, I have never seen it reported that stock caster adjustment was achieved with a 2-1/2" lift on a Taco.
Good camber and toe adjustments can be achieved with the lift.
Some have decided to live with the less than ideal caster.
It would be interesting to see your post-lift alignment report ?