Hi,
you are correct. There is no DCD in CRE, so if you install the file connector mkp in a CRE, I don’t think you will see anything of the functionality it adds. (I’m not aware of any way for an mkp developer to stop a CEE only mkp to be installed in a CRE instance).
So I’m afraid with CRE, you either need to write REST-API code yourself or try if you can get First Steps and Hands-on to the CMDB Syncer - YouTube to work (haven’t tested it, but @bkuhn said it would work with CRE 
Cheers,
Gerd