Well Yeah... OK... but the airspace is delegated to the UK, therefore the UK is setting the rules in that piece of Airspace.
If the French decided to pull back that delegation, as they have considered for some of the airways further east, I am sure the IMC would no longer apply there.
Anyway the spirit of the question was only a little bit of fun to see if anyone had asked and received a response from an authority allowing them to use it.