Excellent addition to the KX2 or KX3!
For KX Buddy Key
The slim profile jack is such a good idea! Easy assembly if you have reasonable soldering skills. This will be a permanent fixture on my rig. Great to have a place to plug in the key AND have an option for computer keying.
Note that the tip/ring connections are reversed compared to the key jack on the side of the KX, so you will need to set the menu for CW key2 to "dash" (assuming you are right handed). Not at all a big deal, since it is a set and forget option once it is done.
I could not find a short slimline pigtail (3" or 6") to plug in. There are lots of longer cords which work well. I slightly modified a right angle connector and it is perfect for me. I would include a picture, but don't see how to do it on a review.
This adapter from W6IPA is a great addition to the rig.
Response from W6IPA | May 20, 2021
I have found the following to work:
https://www.amazon.com/dp/B008DWGLA0/ref=cm_sw_em_r_mt_dp_90JDEZ0TH8JSSX4EQ469?_encoding=UTF8&psc=1
or
https://www.amazon.com/dp/B004G7U40Y/ref=cm_sw_em_r_mt_dp_VMRYYYY2PS2JMPT37NZK?_encoding=UTF8&psc=1
W6IPA.
