The answer has to be that if you are in the exact situation of wanting to fit this lever lock to your door, and you have the lock, and for the sake of argument you have rearranged the levers; then if you take the lock and the original key into a locksmith, then the only reason he wouldn't cut keys to code for you would be that he isn't equipped to cut keys to code.
In other situations where you went in with just a piece of paper with the required cuts, then it would be possible to get a refusal on ethical grounds.
Sorry if that's all obvious.
