First, I agree with most of the comments above: It isn’t discrimination to say, “Sorry, but I can’t send mail to the following countries from Japan . . .”
But if you do want to somehow include everyone, here are a few other options:
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Say that if the winner is from a country to which airmail from Japan has been suspended, you will hold the card, and mail it when/if airmail resumes in the future.
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Allow a winner from a suspended country to nominate a Postcrossing friend from a country you can send airmail to, to receive it instead.
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Allow the winner to pick a recipient from this list: Education - Postcrossing Community (school projects) to receive the card instead.
I don’t think you’re obligated to offer those workarounds though, just that you could if you want to 