Since the person in question knows ahead of time that he doesn’t know the bracha acharona by heart, he should forgo eating at the kiddush until and unless he, somehow, arranges to have a copy of the bentsching available.
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Since the person in question knows ahead of time that he doesn’t know the bracha acharona by heart, he should forgo eating at the kiddush until and unless he, somehow, arranges to have a copy of the bentsching available.