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The reason why there's a single intercooler and not a twin set up is because you have to have the intercooler facing forward. There's not enough surface area of the face of the bike to mount any such twin intercooler setup.
The other factor you haven't discussed is the problem of the stock components. A carb setup wouldn't work with a turbo efficiently. When the turbo creates pressure, you would need tons of fuel. When it's not making +pressure, all that fuel in a carb setup will cause the engine to run rich. This is primarily why EFI is required for a turbo setup. It's why you will find old carb'ed muscle cars with superchargers and not turbochargers.
I can't imagine anyone running 23psi into a 250 engine. I won't say it's not possible, but the chances of the engine surviving more than a single run wouldn't be high. You would need to lower compression to run high boost. If you can reliably make X amount of HP at 12psi and retain the stock compression ratio, that would be easier than having custom pistons made to lower the CR so you can run more boost and make the same power as X @ 12psi.
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