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I used to use fixed format subdomain addresses that used a combination of a mnemonic and the year and month e.g. for this site I might have used emd2211@... My sieve script did check that it was the right format with exactly 4 digits matching sensible valid dates, but I never saw any attempt by spammers to make-up similar addresses. I don't think it's much of a problem. Using a subdomain may help to make it clear that there's no point in making-up addresses.
The reason I included the year+month is to prevent me from reusing an address, but for a 10 year window it gives a 1% risk of an accidental match on an address ending in 4 random digits compared with 10% for the modulo 10 test.
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