I can confirm that quickly pressing the power button on the TKB will do both jobs of adding and removing it to and from your network
I have three devices I am struggling massively with, I have tried the exclusion process and nothing excludes so I assume these are no longer joined to anything... And then pressing the button multiple times during the inclusion process isn't doing anything
This is the process I am following but the LED doesnt go out on the 4th press/hold
Sorry Phil, I got rid of all my Zwave gear ages ago and went all in on Zigbee so I'm not going to be any help with this.
No problem, I will persist and hopefully will get some joy