Sounds like a pointless excercise to me.
If you have a bad wireless connection, plugging it into a NIC isn't going to magically make it better (even if you could do such a thing) - it would still have to go through the wireless adapter with all the inherent problems that brings.
If you genuinely can't use a wired connection and insist on using wireless then there are better ways of trying to improve the situation, such as using improved aerials, wireless repeaters etc.