They are not hard to find you just have to be willing to pay about 600-800 dollars for one that has been modified to fit USDM cars. Unless you are pretty capable at welding yourself then you can find un-modified ones for less.
Another, possibly less expensive, option is to mod the USDM steering wheel rim into that shape and have it re-covered with leather. You'll need some welding skills but that should be easier than machining the hub JDM --> USDM.
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