I've seen that often, together with the relative pronoun, a personal pronoun appears, both in nominative:
e.g. (…) und wir, die wir als Arbeiter gemeint waren, hatten Spaß.
Is this wir a double subject? Is it emphasizing the relative die? I guess it's allowed, as allowed as it would be not to write it. Is there any difference? Is reflexivity needed in order for this nominative duplication be valid?
How about pronouns which would lead to a conjugation-ambiguity?
e.g. (…) wohingegen ich, der ich das gegessen habe/hat, satt war.