>> Does it make sense to publish a DMARC record to signal that a host
>> should never send email? Can said record be published without an
>> accompanying DKIM record?
>
>See  
>http://www.m3aawg.org/documents/en/m3aawg-protecting-parked-domains-best-common-practices

Quite right.  While you're at it, assuming the domain doesn't receive mail 
either,
also publish a null MX.

R's,
John
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