The CCP-C isn't a course, it is an exam. CCEMT-P will give you a decent enough prep for the CCP-C and perhaps to a lesser extent, the CCRN. However, you will need a couple of thousand hours as an RN in an acute or critical care setting before you will be allowed to sit for the CCRN.
The CCRN still looks impressive on a resume, the CCP-C still has people asking 'wassat?'