Two possible solutions for this issue that I can think of, Maria.
Have an option to rebind navigation from tab to another key.
As previously mentioned, have an option to disable tab navigation within the Accessibility Settings that already exist within the game.
Having accessibility features is great and I applaud your work as a team for striving to add more, however this one in particular conflicts with many of the current user base. Both solutions will fix this while still having the feature in place.
The first is simple but may not be intuitive as tab is the navigation key across all software, which would make the second more desirable. Not many people who have tab set as their inventory key will need this accessibility feature so in addition to having it toggle-able, anyone with inventory bound to tab could have the feature disabled by default as opposed to the global default of it being enabled.
If you have all the protection pieces on every piece of armour, then this would be intended.
ilmango explains it well during his video: https://www.youtube.com/watch?v=pIBIuSTdQD8
What if in addition to an option to disable/enable, there was a function key bound to toggle it? It would act in a similar manner to the way F11 toggles fullscreen. The client remembers that and it would work well for this I'd imagine. There are many vacant function keys available. So if someone accidentally disabled the feature, they could re-enable it by pressing the key?