I am really glad to hear you like your T400. Unfortunately, the two parts in question (Bluetooth card and Integrated Camera) are not Customer Replaceable Units (or CRU's).
If you look in the HMM that Ortegaluis references....Parts List --> LCD FRU's....you will see the CRU ID column is labeled 'No'. What this means is only a licensed Lenovo servicer can replace these parts. Even if you could obtain the parts, any attempt at replacement by a non-licensed servicer will invalidate the terms of your warranty.
Since both parts require manipulation of the LCD (the camera more so), training is required as to not damage the one sensitive part that makes up the bulk cost of the system.
Unfortunately, your only option if you want the integrated solution is to either configure them at the time of purchase or pay a licensed servicer after-the-fact.