So why not stay with your current setup and just add a dyno hub? You may also want to read Peter White's info/rant on custom wheels.
Also, why not run the widest tires the LHT can take? As discussed in other threads, running higher volume, lower pressure tires isn't going to do much to your overall speed, and will likely improve comfort. And, as Grant Petersen likes to say, as far as suspension goes, air is pretty cheap.