I got an associated letter from CAA medical when they issued my Class 1 with an OML there is nothing on there to indicate any further requirements unless clinically indicated in the future. I've done 2 revalidations since, one wanted to see my latest blood test that I have done every year on the NHS to keep track of how PCKD is progressing, the other didn't even ask for that. It's a bit of a role of the dice as to how affected by PCKD you will be in the future. Current job market is pretty dire but that could all change in a few years.
UK CAA no longer issue Class 1 initials with an OML. But there is a work around. Instead you get another restriction that sounds pretty career ending which states "Not valid for any commercial operation" - kinda defeats the point of a class 1.... but then you get it instantly revalidated (expect to pay for that!) and they can now issue you an OML as it's no longer an initial - Bureaucracy at its finest!
Best of luck with it all. Let me know If I can be of any further help.