There is no such thing as cri privileges for FI. Cri is a JAR construction which they really didn`t know what to do with when it appeared. So much so it was ontract that invented the syllabus for it. You have to apply for a new rating if you wish to have cri. You can`t just ask the fie to make it a cri this time.
Only difference between unrestricted and restricted is the requirment to be supervised and no first solos to be authorised. Even if the pilot hasn`t flown for 20 years they have still gone solo so the restricted instructor can signed them out.
The other time i have used this is when someone got failed for class 2 with a current ppl and had a NPPL getting processed with a NPPL medical in hand but no license.