But then commonality is the big issue with airbus. All their aircraft are pretty similar set up and mixed fleet flying is possible between pretty much every combination of aircraft. Even stronger is the connection between the newest aircraft and the second oldest FBW airbus, both share the same typerating (A330/A350) and can and are flown in a MFF operation with the A320 series.
And yes, it might sound glib, but the numbers seem to prove airbus right. All in all they are not less safe than their boeing counterparts.
Control linkage in all probability would have to be done electronically via force feedback, which includes a lot of stuff, like redundant electronic signaling, servos and so on, it is of course possible, but would change the very fundament of the airbus flightdeck philosophy. So i guess it won't be done.