I'm not a native speaker, but AFAIK if you use "they" to avoid specifying a gender, it's "singular they" (https://en.wikipedia.org/wiki/Singular_they https://en

I'm not a native speaker, but AFAIK if you use "they" to avoid specifying a gender, it's "singular they" (https://en.wikipedia.org/wiki/Singular_they https://en.wikipedia.org/wiki/Singular_they), so using the first person plural still doesn't really make sense...