The PRC8 can work with CEP, CEP2, CEP3 and ProjectQ, but there are some minor issues. All of these can be resolved by using a merge hak and tlk file. The merge hak sits above both PRC and CEP in the module custom content list and contains the 2da files that both CEP and PRC change. The merge tlk is used instead of either individual tlk file.

To make a set of merged files, start by creating a new clean module in the toolset.
Then add all the CEP content as per the CEP instructions.
Save the module and exit the toolset. Then run the PRC Module Updater on the module.
This will complain about some conflicts, but should sort most of them out.
It should produce a new hak and tlk file naed after the module in your hak and tlk directories. To make it easier for future reference, I would rename those files into something recognisable, such as CEPxxxPRCxxx. You can also delete the module as it is no longer needed.

At this point, the merge files created will work on a basic level, but will have a few bugs. The main files that has problems is baseitems.2da so I suggest you extract that from the merge hak and from prc8_2das.hak making sure that they go to different directories so they dont overwrite each other. Then use a plain text editor to copy the lines 0-112 from the prc8 version over the same lines in the merge version. After than, put the modified merge version of the 2da back into the merge hak.

Now your merge hak should be complete and free from any issues. One more think to remember though, when changing a PRC8-enabled modules custom content from the toolset, press cancel as soon as possible once the toolset starts recompiling. If you dont, the toolset will crash when it tries to recompile the PRC8 scripts.