Andrew Demko made a new blade for a Cold Steel knife for a member here, but that was a couple years ago.
The Mini-Griptilian is available with a handful of different blade steels, and Spyderco mixes up blade steels on some of their knives, but I haven't heard of other companies doing it.
The cost of doing things on an industrial scale means that a big company has to be pretty sure of a market for the product before they go making changes, so many companies are risk-averse: if it ain't broke, don't fix it.
I believe that many custom makers would be willing to try re-blading a knife for you, with the understanding that it would violate any and all warranties from the factory.
You should also be very sure that you are not going to want to sell the knife, some time in the future, because then you would be liable for a copyright violation lawsuit.