Edwin,
good arguements for both cases. In my view though you would be better having each half independant of the other on it's own rod and servo. The big 3D planes seem to be set up like this so guess they know athing about these setups.

I'm building the same plane and kit as you and I will be using the splt elevator setup though I will be using bolted ball links at each end to remove any slop and provide a bit more security to the linkage.

On my P51 in the pic attached you will note the 3/8 alloy rod going down to the elevator. The ele halves are joined via torque rod. The 3/8 rod in turn connects to a disc thing you can see in the centre, it is on rails so it can slide back and forth. 2 x JR DS559 connect to the disc and if one servo failed I still get hald elevator travel which is enough to recover the bird. It is an excellent setup and I wish now I had done this for the P47.

I will most likely do it for the Corsair when I build that.

cheers
Peter