If Namine is Kairi's nobody and Kairi can wield the keyblade, shouldn't Namine be able to wield the keyblade too?

No because Namine isnt part of Kairi if 你 listen in Kingdom Hearts 2 on the computers behind DeZ (i think thats his name) and Ansem theres a computer with Soras regeneration + in the cut scenes theres a computer that says ''27% Regeneration) 或者 something like that, also in it Namine 说 that Roxas and Sora are connected Kairi and Namine are not connected (Hope this helps) ~keybearer

No, because Kairi didn't initially have a Keyblade. In Kingdom Hearts II, Riku personally gave one to her, and at that time, Namine already existed.

I´m not all that familiar with Kingdom Hearts yet so don´t take me too serious but I guess theoretically Naminé should be able to wield a keyblade. Cuz she´s somewhat created out of Soras body and soul and Kairis 心 或者 so and is Kairis Nobody. I don´t know if that matters but we all know Sora can wield a Keyblade. And since Kairi touched Aquas Keyblade once when she was a little child and still in Radiant Garden she can wield one too.
So 你 see theory says Naminé should be able to wield a Keyblade but I think it hasn´t been proved whether she can 或者 she can not wield one.

Sorry if that is total bullshit but that´s it as far as I know

No, because they aren't connected really. But, Kairi should never had gotten that keyblade. She's useless, anyways, and I don't think that helped!

Never namìne created them all so,ha