LOL In your dreams or are you one of the rejoin by stealth believers? Labour have said they intend to work on Brexit problems. This might just be to continue to be able to join in with EU projects when they appear. Chipping in makes sense as it allows things that we couldn't afford to do on our own or to just save money.
LOL Changes that loose our Sovereign rites. One aspect I have wondered about as if we export there we have to meet what ever statuary requirements they have set. Dangerous ground politically so I doubt if there will be any changes in this area.