After re-reading the exchange, I see that what telepati wants to do is not possible with OCLP.  OCLP always configures NVRAM -> Add -> 7C436110-AB2A-4BBB-A880-FE41995C9F82 -> csr-active-config in the OC config.plist.  OCLP does not provide a way to leave SIP "untouched." If telepati has any hope of achieving his objective with Open Core, it will be as stated 
here, but I have not tested this.
EDIT: I'm still not certain that I fully understand the SIP requirement, but if the requirement is for Open Core NOT to change/control SIP, then this cannot be achieved with OCLP as it is currently designed/released.
EDIT2: 
@telepati you may also need to remove NVRAM -> 
Delete -> 7C436110-AB2A-4BBB-A880-FE41995C9F82 -> csr-active-config from the OC config.plist (if it is present).