You shouldn't be contacting anyone other then AB and using the file reference you got in BUD. They can send the bags onto a different city, even one they don't serve. Once there the bags can be delivered. However contacting bag handling at whatever city you tell them to deliver them will do nothing. Till they get the bags they have no real part in it.
Had this happen with BA flying out of ZAG and onward to PVG and small Chinese city. They couldn't get bags there before I would leave, so I told them where I'd be next (Africa). Even though no partners they got it to that city via another airline, and the bags were delivered the next day after arrival to hotel. Basically all contact should be with the BUD handling agent/AB, doesn't matter where you want the bags to goto.