Interfaces for K3 for CW and MMTTY/FSK/CW

Using a single serial port to allow CW and RTTY in N1MM without any cable switching
On the K3 CONFIG PTT-Key setting, it needs to be "Off-Off."
It has been reported by some that (under some not fully defined conditions) it is possible to use a USB-Serial converter to key FSK RTTY with MMTTY so you don't need a serial port at all. I tried the recommended method and could not make it work.
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CW Keying a K3 with USB-COM Adapter with N1MM
How to have both CW keying and radio control on a K3 without a COM port on the computer by using a single USB-COM adapter
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