Quick access to auto-ISO on XPro-2 ?

I know that I can assign one of the Fn buttons to quickly access the settings for auto-ISO, however I do not want to dedicate one of the six Fn's to that roll.

I do not see options to do this on either the Q Menu or My Menu. Am I missing something?

I don't change this setting often, but I would like easier access to it than by scrolling the main menu.

Thanks,
EB