I've seen DOTDs with chiruwa handles posted here for many HI models. Some are less common than others, but you can either wait for one to show up and try to shark it here, or email Yangdu with a request, which might also involve waiting if she doesn't have one in stock.
The main exceptions are models that have carved figures at the pommel end, such as the Hanuman Special, where a chiruwa handle probably wouldn't make sense. Typically those are collector models rather than hard-use models, though you can probably get away with using any HI knife within reason. But if you have several khukuris, why would you pick a beautiful museum piece to take camping?
The term "full tang" is used in two different ways. The chiruwa style might be called "fullest tang." Most HI knives have a full tang in the sense that the tang goes all the way through the handle and is peened over at the end. The laha inside the handle plus the peening at the end make this a very secure handle, even though it might not look as strong as the chiruwa style.
I'm partial to chiruwa style myself because I like the look, but I don't think it's necessarily any better or stronger than regular full tang. The main advantage to a chiruwa handle is that it's easier to rehandle if an accident cracks the wood or horn. In a pinch you can wrap it in some kind of cord as a temporary patch. Some people make permanent handles out of cord-wrap.
-- Dave