Hi Kay,
I can try to help.
1) For CCC, I say sub w/a high impact cardio (if possible). Perhaps MIC? If you want to go low impact, perhaps Afterburn? CCC is very intense, so you should go for an intense cardio session that would burn approx 500cal/hr.
2) Hiit workouts are very intense, high impact cardio in 30min. Perhaps the blasts only from any Imax w/o (take out the step portion).
3) Intensity resembles Imax3 IMO. You can sub with any Imax if preferred since most people seem to love Imax2. Even LowMax would be ok if you want to make it low impact. Intensity however includes a 15min bootcamp at the end which includes plyo, firewalkers, push-ups, weight training ect. Perhaps do 45min of an Imax and then 15min bootcamp of choice (DrillMax, Bootcamp from Intensity series ect). The total of Intensity is 60min.
Hope this helps!
Natasha