You know I've never thought about it that way. The shocks themselves do have weight so making a solid link that weighs the same as the shocks and springs but at a length that you intend to set your ride height at should work. This will definitely take the spring variable out of weight balance. Once you get it evened, then you go back and install your shocks. Set your spring rates until both sides agree with your previous balancing. Then you know you've got the springs evenly adjusted.

I personally like the idea.