That would work. You might even consider loading them to google docs as a googe presentation, If you have your powerpoints, you can gradually start adding audio to them using one of the free online programs.
I teach 8th grade science and the upcoming school year will be my first time flipping my classes. I have used powerpoint heavily in my classes before but in my district students do not all have ppt on their computer or even have a computer. I have screencast my powerpoints and then uploaded the video to youtube which allows my students cell phone access to the information. If your students all have computers at home, they could download the powerpoint viewer and see your presentations even though they won't be able to edit or create one. Microsoft's website is http://www.microsoft.com/en-us/download/details.aspx?id=6.