In case anybody else is looking to do the same thing, here is my BASH 
solution:

    - name: Sanitize Virtual Interface(s)
      shell: |
        file="/var/ftp/vm.cfg"
        total=$( grep ^vif "$file" | grep -o mac | wc -l )
        for i in `seq 1 $total`; do
          my_random=$(xxd -l 1 -p /dev/urandom )
          my_random2=$(xxd -l 1 -p /dev/urandom )
          sed -ri 
"s|mac=00:21:f6:((\w{2}(:)?){3})|mac=00:21:f6:aa:${my_random}:${my_random2}|${i}"
 
$file
        done


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