Relative clause with personal pronoun: "wir..., die wir..." for non-reflexive verbs

Question

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.

Answer 1

This is perfectly fine, and indeed does not lead to conjugation ambiguity, but resolves a conjugation awkwardness.

... ich, der das gesehen hat, ...

is maybe correct (I am not sure), but at least confusing, because hat does not correspond to ich.

... ich, der ich das gesehen habe, ...

does not have this problem.

Answer 2

The main clause in the sentence is:

"Und wir hatten Spaß."

The rest of the sentence is a subordinate clause that acts as a "parenthetval" in the sentence: (die wir als Arbeiter gemeint waren),"

This is a perfectly acceptable construction.