1) End of EU commissioner/president appointments. These should be directly elected by the Members States populations.. think "US President"-style elections.
2) Move the European Court of Justice or the European Central Bank to somewhere in the UK (not London)
3) End the monthly move of the European Parliament to Strasbourg.
4) Probably a few other things he can come up with...
Come back to the UK and offer this new deal (and Remain) or full out (with all the implications like loss of NI and subsequently Scotland) to the people in a new referendum.