- A50 extension at least until end of 2019
- UK participation in European elections (to keep all Brexit options open)
- Primary legislation making "revoke A50" the default outcome, i.e. stronger version of Cherry amendment
And in return, he could pledge to give Theresa May 6 full months to get Brexit sorted, during which time Labour will not hold or support a VONC.
Of course, all of the above is fantasy. But wouldn't it be nice...