A way around this is to present philosophy by field: ontology, epistemology, logic, ethics, aesthetics, etc. and have the students discover what philosophers in the different ages have to say. I do this in the "Meeting of the Great Minds" forums with high school and college students. Students have to study a philosopher, gather quotes and biographical information about the philosopher, and in the forum stay in character as he or she interacts across the ages with other philosophers.
The meetings are great fun and a good way to review at the end of a unit.
Related: A New Batch of Philosophers