Send a leaflet to every household in the UK explaining that the single market works differently for EFTA members, and that EFTA members are not required to be part of CAP or the Common Fisheries Policy. Also the fees paid by countries are lower.
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Public discourse in the UK has been poisoned by the idea that there are only two options in the EU membership debate. Many people do not want to give up their freedom of movement, as is evidenced by some leave voters applying for EU citizenship. Immigration is sliding down the scale of people's concerns. People want companies like Nissan, who need to be geographically close to their markets, to continue trading as before. EFTA delivers the above but increases UK independence.