The medical requirements for the "CBM IR" (as it is now called, apparently - competence based modular) seem to be the same as the ones for the JAA IR.
I have heard that some pilots have got the JAA IR in the UK with a day-only restriction. It seems very rare. But then the day-only IMCR was totally unheard of - until some people revealed the CAA had been doing it for years, quietly.
There are some possibly helpful medical concessions around in the UK -
here
The IMCR looks like it will continue.