Apart from legacy UK ATPL(A) and UK CPL (A), the rules regarding the IMCR / IR(R) changed a while ago. The credit is now as follows:
An applicant who holds an ICAO IR(A) or military green Instrument Rating (Aeroplanes) and has passed a single-pilot IR test in the 24 months preceding the date of application for the IMC Rating / IR (Restricted) will be credited with a pass in the initial IMC Rating / IR (Restricted) Skill Test and the written examination. The applicant must apply for the issue of the IMC rating within 24 months of the last IR test passed.
The IMC Rating / IR (Restricted) will be valid for 25 months after the last day of the month in which the last IR test was successfully passed.
An IMCR / IR(R) may
not be revalidated with any multi-pilot IR credit. So a multi pilot LPC would not be acceptable for the purpose; a pilot would need to follow normal IR(R) revalidation criteria.