Boris Johnson worries about a “road to serfdom” so I propose the EU offers a special Boris Johnson deal where the UK would elect MEPs, have the PM and minsters sit in the European council and get a vote on all regulation and EU appointments, if it rejoined.
IIRC it cost Sweden a fortune in 1962 with a very small fraction of today's UK population and a tinier fraction of the built infrastructure.
I'm all for Rejoin but the cost of the switch in question would never survive a rational cost-benefit analysis. It's a cosmetic, totemistic distraction.
Take all the private cars off the roads, and implement integrated mass transit solutions between all destinations, and the switch might be practicable.
That's decades away though, even if we survive that long.