As posted do a high class bodgy. Make sure the keyway on the shaft is as square as possible with a file or such and make a stepped key.
Have had to do that years ago on shaft and couplings that weren't the same for what ever reason. Not often but had to sometimes.
If it's lasted that long on that one if done properly with some retaining compound for good measure you don't really have anything to lose and it may outlast the car
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