[Elecraft] K3 External 2nd receiver with KXV3 and 6m pre-amp?

[Dave G4AON]

I've just ordered a KXV3 and was pleasantly surprised to find they are 
more or less a stock item.

In order to use one with an external receiver simultaneously with the K3 
main receiver, it appears necessary to use an external resistive 
splitter or better still a hybrid coupler feeding one side back into the 
K3 and the other to the external receiver. I wonder if anyone is using 
such a set-up and has any thoughts on it. I had rather hoped the RX 
output socket was a buffered output from the K3 receive chain but sadly 
it isn't.

I also have an Advanced Receiver Products P50VDG 50 MHz pre-amp on order 
(http://www.advancedreceiver.com/), again anyone else using one of these 
with their K3? It looks easy enough to connect as a direct pre-amp via 
the in/out sockets on the KXV3.

73 Dave, G4AON
K3/100 #80