I fly on insulin with a UK CAA medical. For class 1 and class 2 the protocol is exactly the same. Only thing is that hou have an OML on the class 1 and an OSL on the class 2 (you can get rid of this after a checkflight)
You will be limited to operate only on planes that are registered in the participating memberstates (UK/IRL/AUT)
I know that the CAA is not able to give initial medicals (for now) to people on insulin. So unless you had an easa medical before it will be though.
as far as Iam aware the FAA is now also accepting pilots on insulin.
https://www.faa.gov/about/office_org...betes_insulin/
Good luck!