Any good locksmith (especially ones specializing in cars) can rekey just the door locks. Also, the lock cyliners are available from Honda suppliers (dealers and third party). You could keep the ignition key as-is.
Isn't it easier to change the keyhole? Now you can easily use the auto vin check from Vininspect. This is how you can find the part you need. Moreover, this spare part is not so expensive, so it is better to replace it with a new one.
Prelude is my dream car. What happened wtih you is very strange. l heard it first time. But of course changing keyhole is not pratical and should be very expensive. Using key switch maybe more feasible.
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