You guys are very trusting of super-advanced species who already showed a strong willingness to manipulate humanity with superstimulus and pornographic advertising.

I'm not planning to trust anyone. My suggestion was based on the assumption that it is possible to watch what the Superhappys actually do and detonate the star if they start heading for the wrong portal. If that is not the case (which depends on the mechanics of the Alderson drive) then either detonate the local star immediately, or the star one hop back.