Your wobble has absolutely nothing to do with the steering linkage geometry. And if the WJ swap was worth the work, I would've already done it. Just my opinion.
I know, & I stated that a few posts back. The bigger brakes are the main reason for looking into the WJ swap with the added bonus of getting rid of the inverted Y. I figure the WJ swap could be done for considerably less than the Vanco kit, & since, as you stated, backordered with no indication of when production will resume, the WJ swap looks a little more appealing.
From what I've read in a few swap threads, it doesn't look like THAT much work. Spacers on the knuckles, relocate the track bar & possibly notch the frame, & flip the TRE. Sure as hell isn't nearly as complicated as some of the mods we do.
I know just raising & shortening the track bar on the axle isn't the 100% correct way to do it as far as geometry goes, but I highly doubt it's going to make a noticable difference. Most do it this way that are still running the stock spring locations. If I wanted to throw an extra grand at it, coil overs would fix that issue quick & the track bar would run to the knuckle.
BTW, as of September 13, 2012 @ 12:28pm, just 8 short months ago, you were planning on doing this exact same swap according to the thread I was reading on Wrangler Forum "just to do it".