I know a chap in the UK with similar condition, not sure of the details but he 'obtained' coloured contact lenses (one red one blue - I think??) and was able then to pass one of the Lantern tests ( can't remember which one) that he previously failed.
He then argued with the CAA that if he wore the contacts and carried a spare pair of similar coloured glasses (as for short-sighted/longsighted pilots) then he would be fit for a Class 1
They finally agreed. . and I believe he is the only colour-blind commercial pilot in the CAA/JAR
Worth a try. .?
