Currency for the IR should be exactly the same as for IMC.
2 approaches in a suitably kitted single, one ILS and another approach would do. No instructor required just a safety pilot unless flying in IMC, could do it without a hood then. Say within 90 days otherwise no pax until you have.
The IMCR is a fantastic privilege which is regularly slagged off, but those doing this keep picking the wrong reasons
Go on then tell us the right reasons to slag it off