With apologies for not helping with the actual question..

.. why involve AWS CloudFront? 

A VPS is easily capable of running several dozen WP sites, provided you avoid the 'front page of Slashdot' effect. Another 'similar to Bitfolk' one has a couple as well as a busy (hundreds of messages posted a day) forum with no problems. 

The example site could be easily made static via a plugin = even less server load. 

Unless you are running really busy sites such that the VPS often struggles or actually get denial of service attacks, I can't see the value in the extra hassle and expense. 

Ian