There is no such thing as a 'Competency based IR'. There is, however, a competency based
course that leads to the issue of an Instrument Rating but gives credit for previous instrument instruction and experience.
Your alternatives, therefore, are:
- IMC Rating (entered into an EASA licence as an IR(R)) - valid only in the UK
- En-route Instrument Rating - valid throughout Europe but does not permit IFR departures or approaches
- Instrument Rating - full IFR privileges throughout Europe (and beyond)
Clearly, if you hold an IR (whichever course you followed), you do not need an EIR or IMC Rating