IMO it would probably be 5 times cheaper to get a custom knife from a different maker. You will not get the toughness of a Busse, but can get a pretty good preforming blade depending on blade geometry, size, .... But You could probably get a custom knife with mirror polish blade or something,..(up to you) and custom handles to match the bike for around $350. If you get a knife from BUsse its $100 per inch, plus the handles to match your bike would be extra. (I'm thinking something with a 7 inch blade). I've contacted many custom knife makers in the past, and could get a knife with pretty much any kind of steel and handle material I wanted (besides weird stuff like giraffe bone, or dinosaur turd) you know like micrata, g10 or carbon fiber, or stabilized wood, and was never quoted more than $400. I imagine a 7 inch knife from Busse plus handles would run you double that easy.
Oh, and also as far I have seen, Busse cannot give you a definite time on completion or your custom order, so you might wait a year to get it. I understand why they have to do this, (stop production of regular knives just for you,) but personally I would go crazy if I waited a year. Most custom knife manufacturers have quoted me 1-2 months. So bottom line, IMO If you go with a different knife maker, you could have endless options for your knife, with half the cost of a custom Busse, with 5 times faster production time, BUT if you want the same knife to be one of the toughest out there AND you dont mind the wait, you might go with Busse. Thats, just my .02