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what is universal solvent? a one way trip with solar sails could still be used to send probes to the near by stars, and when you get to a near by star the solar wind would be changed and they could head back, although I here they plan to use lasers as a booster so coming back would take a lot longer, and the overall trip would be too long to actually send a person.
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Universal solvent is a theoretical substance that can dissolve anything. The problem being that it would be impossible to make a bottle to store it in because it would just dissolve it.
A solar sail can only be a one way trip because even if you turn around and use another star as an energy source, you would never be able to approach our solar system again because you'd be pushed back by our sun. That's a moot point anyway, because a solar sail will only be able to pick up speed whilst it's fairly close to our sun - it wouldn't be practical for interstellar travel.