The legislation that permits national qualifications such as the IMC Rating to be entered into EU licences expires on 8 April 2019. It is possible that the EU may choose to extend the legislation, or even make it permanent, but there is, as yet, no confirmation of this. The UK CAA was entering the IMC Rating in EU licences before the legislation came into effect and it appears, from TOO's comment that they are prepared to do so again if necessary. Of course, depending what happens on 29 Feb, the whole question may be moot.