I almost went there awhile back, and may still.
Might as well install some real height adjusters in the torsion while at it >;-)
Here was my inspiration for adjustable inner pivots
http://tr6.danielsonfamily.org/TrailingArmKit.htm
Would need some redesign for our use, but the large dia inner "crush tube" in the bushings should make it pretty sturdy.
Anyone offhand know the proper shock length with aluminum arms in a T1 or T3 with std upper mounts?
(T3s upper mounts are double shear BTW)