Insanity/Chalean Hybrid?

Hi all. This is my first post. I recently bought Insanity and will be starting that up in a couple of weeks after I finish my P90X (4th round) and TurboFire hybrid. For those of you that have done Insanity, do you think it's too much to start it off as a hybrid program with Chalean Extreme (which will be my 3rd round of that)? I was thinking of following the Insanity calendar as written but adding in just 3 days of week of strength training only. I'd love to keep TurboFire in there too because I absolutely love it but I think that will be just way too much. I've been an avid runner for years but I plan on laying off running for the duration of Insanity. Any advice--what's too much or too little--is appreciated. Thanks!