[Elecraft] Using a straight key and microKeyer II with an Elecraft K3

[Rich]

I believe I've read that you can use both a straight key and a 
microKeyer II by using a TRS Y plugged into the K3, and then plugging 
the straight key into one receptacle and the microKeyer II into the 
other receptacle.

Is there a better way to connect both a straight key and paddles with 
this system ( microKeyer II and K3)?

Thought I'd better verify before I tried it.  Thanks.  I"m working on my 
Morse code and would like to practice separately with my paddles and my 
straight key.  If I can set it up permanently I'll probably get more 
practice than if I have to plug one in and then the other.

Thanks.

Rich NU6T