It might be possible to find a single-carb manifold available from a similar model. If not then you might be able to convert one by fabricating an adaptor plate or by some other such method. These will all be made of iron or steel, PVC doesn't sound like a great idea at all.
To raise the gearing, you'll want to fit a larger front sprocket and/or a smaller rear sprocket.
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Spoken like a champion. Oh no, disaster!
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