LASORS H1.2 says "The privileges of the holder of a FI(A) rating ... are to conduct flight instruction for: ... the issue of an IR(A) provided that the instructor has met the requirements as detailed in Section H1.4 - Removal of No Applied Instrument Restriction;"
H1.4 says: "Have flown at least 200 hours flight time in accordance with IFR ... Where pilots wish solely to instruct for the IMC Rating a reduced experience level of 10 hours flight time by sole reference to instruments is applicable ... "
... so if you are an FI with the "no applied ..." removed and with the relevant experience you can teach for the IR. An IRI is only relevant if you don't have an FI rating (see H2).
HFD