For what it's worth, I've had what could be called a sanity episode, and have decided not to pursue this project.
I like my bike the way it is, and really don't want to beat it up (or my body either) on the rocky roads around here.
Besides, if I decide I really want to play in the dirt, there's lots of used 250 dirt bikes around here that I could probably pick up for less than the cost of modding this one.
Some thanks may be due to Jack Straw for adding a bit of sanity to my thinking with his "Now What" thread. I think I've done enough mods to my Interceptor.