Ronin,
I was thinking about fabbing something up while laying in bed last night. The issue that I would have to overcome at that point is the pinion angle changes I would see fron raising and lowering the front of the arms. I could use shims between the LCA and rear until I found what I wanted angle wise, then cut the bracket loose from the rearend and reweld it.
This is similar to the idea I would go with (Post #20)
http://performancetrucks.net/forums/showthread.php?t=384688&page=2 But at that point it would almost be easier using a ladder bar with and adjustable lnik to adjust pinion angle.