It's a possibility.
However nobody has any idea at present what kind of private IFR options will exist under EASA, below the level of the full ICAO (currently JAA) IR. The whole topic is under heavy political pressure and heavy lobbying, being tied up with the N-reg scene etc.
As a simple suggestion:
Have you exhausted the options, i.e. done all the possible (4?) types of CV tests, possibly well away from the UK like so many ATPL candidates are doing?
The Isihara test is a load of crap. You can have perfect real life CV and fail it almost totally.
There is a medical thread here on pprune in the main section. You should get some good feedback there.