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Injection molding isn't terribly difficult to start up. Not unless you want it automated, anyway.
Personally, I just bother my machinist friend if I needed some custom bit made. Rubber can actually be machined (you freeze it first). I tell you what though, I bet that folks around here would be happy to part with their cash for reproduction knobs. The only problem is, you might not get a physical knob to copy. That, and you might want to look into finding a plastic that could pass for bakelite. Or figure out how to do bakelite.
I suppose it wouldn't be terribly difficult to 3D print knobs, as opposed to injection molding them. Low production numbers anyway. But you'll probably need to hand-finish each one. And it'd probably be preferable to print it solid, instead of hollow honeycomb on the inside.
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