Dwight, I have thought about something like that too. The only problem, and you wouldn't think it would be, is that sometimes compatability is different when interacting one or more kits. True they're both the same scale, but if one model is off just a little, then the other kits pieces may not fit well.
You have a good point putting the one-piece treads on the Dragon, since the side armor will cover it up, but I'm a little leary about the indy tracks fitting on the Tamiya. It should work, maybe someone has tried this and will step in and provide an answer.
Good luck on trying it if you do. I might condsider that option also if it works. You get to go first!
"It is well that war is so terrible, lest we grow too fond of it."-R.E.Lee