Why not do your cardio at a different time?
In the grand scheme of things it is not going to make a huge amount of difference to you - just as long as your workouts are correctly fuelled beforehand and you immediately have a PWO shake after...
But for optimal results you could have a small protein/carb drink (more carbs than protein) that you sip during the last bit of your weights workout and just prior to your cardio and then have a smaller than normal (but still significant) PWO shake afterwards.