There are general discussions of GPIO pin conflicts in the documentation but your suggestion is good to include checking the 1-wire interface in the troubleshooting section.
We’ll fix the access problem with that link too.
You can use an alternative GPIO pin for the Zymkey. The steps are outline here:
https://community.zymbit.com/t/using-an-alternative-gpio-pin/589
The other way would be to remap your 1-Wire interface (may be easier with your wiring?) To change the default GPIO pin used for 1-wire communication edit /boot/config.txt and add gpiopin=x to the end of this line (x is your new GPIO pin, no spaces), then reboot:
dtoverlay=w1-gpio,gpiopin=x