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I have had some contact with an organisation in Hong Kong, their website is hkcommunitycompost.org. Hong Kong, urban, high popn density - same problems. They use an in vessel system, with a 2 week turn over period (and probably a 2 week cool down period when it comes out of the machine).
If land is not available (which if everyone works on farms, then it seems land should be available?), then I would think an in vessel system wins hands down. But that requires a cost in labour and power to run the machine.