Has anyone achieved CW TX (not RX) decoding with a Flex-6xxx?

I started learning CW on a KX3 which has a nice feature of decoding your transmitted CW.  The feature is pretty brutal/strict, and has really helped me learn better spacing and rhythm.  I’m trying to figure out how to get my Flex-6xxx CW transmissions similarly decoded.

Of course, decoders like CW Skimmer do a pretty darn good job with RX.  But, they don’t seem to get the sidetone to decode my TX.  

One solution I imagine is to run a hardware lineout of audio from the speaker or headphone port on the Flex into a computer input.  With that, at least I would have the sideone in the computer and could (maybe?) run another instance of CW Skimmer (or another decoder) just to decode the transmitted CW.

Am I missing something more obvious to achieve my goal?   Other ideas? 

Thanks very much.

73

Mark K9BOO