Neiman is a lock manufacturer that supplies most if not all european and british manufacturers.My experience with Volvo and Triumph had me cutting keys from the code book supplied by I think Volvo.Here in the states there is a Company called Curtis that makes key cutting machines that can do most any key and they have code books and now automated grinders that cut keys in about a minute. You need to know the manufacturer,in our case probably Suzuki but they probably didn't make the locks and were supplied by the Japanese equivalent of Neiman and the code and they can cut the key after matching the profile/groove pattern on the sides of the key. You might try a Suzuki car dealer or a locksmith.A locksmith wouldn't need to take the lock apart since you already have the code.OR as others have said you could take the lock apart and play with or remove the tumblers so any key would work.Done right it would look normal and no one would suspect it unless they read this forum and want your brothers bike,Whats that address again?