I share this link which also has an English version on clicking on english: http://www.cycloexpeditionamericas.com/2013/03/mexique-bilan/
The map shows on the article shows the roads I took to go around DF without passing through it to go to Puebla. There is a specific blog post about the area as well. Unfortunately, the Monarque sanctuaries are empty at this time of year.
Etienne