If the guidance has indeed come from SRG then you are bolxed ,you now have a responsibility/ duty of care to seperate everything from everything whether or not they are VFR or IFR, FIS or RIS
Surely this cannot be the case?? We do not seperate VFR in the UK (see and be seen) infact in the FIR we do not seperate IFR, according, to the Airac.
From what OWZ has written A/C are going to get a better service OUTSIDE CAS than they do inside. I would agree with the previous, Grumpy old ATCO get the ATSIN out ASAP, or better still wait until the review of ATSOCAS is completed before making impossible demands on the poor sods concerned who will have the sword of damacles hanging over them.