Realistically, how is this a good idea?
The 'tell them again' campaign will be as bitter, divisive and full of BS as last time. Probably more. Farage, Boris etc will whip up the feeling of betrayal. The positive aspects of the campaign are likely to be drowned out in a torrent of sh1t.
On the other side, Remainers aren't going to stop saying things like 'we told you so' and 'leave voters have died off anyway'. That poisons the campaign further. The many benefits of EU membership are likely to be drowned out. At the very least, Project Fear will be dragged out all over again.
When it's over (and I'd predict a 52/48 split for Remain) all that ill feeling doesn't just dissipate. What next?