I think the best you can do is to fly to BLR, which is served by AF. From there, you may be able to take a train (not sure), or you can take Kingfisher, Jet, or a couple of other Indian airlines. I don't know about BLR, but at BOM and DEL, you need to take a bus to transfer between domestic & international terminals, so be sure to check and factor that in if necessary.