FI(R) Instrument Qualification
I would advise an IMC rating to back-up your FI. There will be times when you might have to instruct in marginal conditions so having an IMC is a good backup. Once you have removed your "no instrument instruction" restriction you can then teach IMC, and can operate on top if conditions allow.
With this experience your IR should be easier. It would seem pointless to get an IR now only to pay to renew (with a training flight beforehand) in a year's time.