It sounds like the current set of tags and structures in OSM don't properly support what you're trying to do at the moment. I think the best way to deal with it would to propose some new tags so that these type of addressing schemes can be properly supported in OSM with supporting documentation.
It sounds like you need some sort of block or sector tag you could set on areas to define them properly. A couple of other tags for addressing like addr:block and addr:sector could then be added. It would definitely take some time before they get supported by the renderers and routers but I think that since a good sized chunk of the world uses these types of addressing systems we should have an explicit way to deal with them instead of trying to shoehorn them into a more European system. It will make it easier for mappers there to do things properly and probably also make things work more reliably. I don't have the experience with this type addressing to feel comfortable doing any of that but if you put something up on the wiki people can use and work on it. Cheers, Greg
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