Ok what you need to do is a hard mod..
Basically you will make BOTH the enter key AND the numpad enterkey both REGULAR enterkeys
you dremel out the traces for the numpad enterkey..
Then you take two wires and bridge that numpad enterkey to your regular enterkey, which isn't very far away..
Don't worry about pressing them both at the same time, it will not explode.. these are switches not capacitors or resistors..
![Cheesy :D](https://cdn.geekhack.org/Smileys/solosmileys/cheesy.gif)
this is a very straight forward mod. post pictures of the pcb and we can tell you exactly which wire to connect where. and which traces to dremel out.