144 hour Beijing entry and 1 month single entry and exit

Hey - yep me again. So... husband has been successful in getting a one month single entry/exit permit for China. However we want to be able to travel. SO ... could he come in from NZ and get the Beijing 144 hour entry, leave for our holiday overseas a couple of days later, and then when we come back come in on the one month entry permit that is in his passport (cos that would be his 'single entry')?
Or do you think that when he arrives from NZ they will see the visa in his passport and go ah-ah buddy, you use this.
Thanks heaps for the answer in advance :)