If Tamiya support is better in Malaysia than Kyosho, that makes the decision for you.
I'm not sure about all this business of street tyres? Is it for 2.2" rims? I know one source of 2.2" 12mm hex buggy wheels are the Academy rims - Academy is a Korean brand, and I'm guessing it's proximity to Malaysia means you will have supply of them there. In the UK, DMS-Racing carry them, and at £3 a pair, front or back, they're cheaper than most, and will accept any 2.2" tyre. With a hex adapter, you could use the rears at least on AE, Losi and the most recent Tamiyas.
I said before - exposed transmissions are surely only an issue for belt-drive cars. As the Kyosho has a shaft, not a belt, that should not weigh against it in the decision.
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