I would like to use the Serial used with the Winkeyer chip from K1EL to control the PTT even when digital modes are used, saving one serial port(work in progress):

Here it is the PCB so far:

And here it comes the obligatory 3D view:

The serial interface is a USB cable with a (claimed) FTDI chip inside that exposes the signals, for easy interfacing with 3.3/5V logic: