Yvsa and I both possess one of the original "mistakes" where Uncle Bill ordered a Hanuman blade on a WWII handle. They showed up with a WWII 18" blade, and a Hanuman handle with all the tools in the sheath.
The combination is not perfection, I suppose, but don't try to tell me that while the monkey is in my hand. He'd probably express his displeasure very directly, and I'd more than half agree with him.
( BTW, they have now upsized the Hanuman handle which I and several others feel was a mistake. )
One thing to consider is consulting Yvsa about putting a superglue finish on the handle once stabilized to reduce drying and swelling due to humidity changes. The other can be done two ways. Either pull the handle right away, let stabilize, clean out all the old laha and enlarge and roughen the hole inside, then re-epoxy on, or just wait til it gets a little loose and squirt some regular superglue into the loose areas round the bolster. Superglue dissolves the laha and rehardens it really well.
It might even pay to tell the kamis to fit but not laha the handle on.
This is all presupposing a problem that may never happen. Villagers with blind handles fall apart cause they are essentially abused all the time. The HI's are in effect overengineered anyway.
Thinking in blue sky terms, order just the blade, get some composite ivory ( made from real ivory dust but bonded together ) and borrow someones carved handle khuk ( putting up your firstborn as surety ) for a model. Epoxy on, pin thru, carve, and superglue finish for good measure ).
I actually worked in a shop where they built things that way. They stayed in business cause their clients knew they'd only have to buy the product once. ( The owner had been chief accountant for Douglas during WWII, and we used to joke that it was a good thing they didn't let him into design. Otherwise, they'd have ended up with a bomber that couldn't get off the ground, but was the world's fastest tank! And then my dad would have beefed it up further. I think I'd feel very comfortable at Birghorka. They think like I do, and my dad before me. )