The title 'Z'

[Theodric]

I do think changing it to (or at least giving an alternative of) "Zeta" would be fair for those who dislike the potential association but want to use the title they earned.

It makes more sense to get "Zeta" from the Zeta weapons anyway.

If they set a precedent by changing it, we'll just see people resort to concern trolling to amuse themselves or push ideologies whenever an opportunity presents itself.

It's not really the business of Square Enix to weigh in on complicated geopolitical issues in the first place, especially when they only ever do so selectively and with whatever safe, mainstream take will gain them praise on social media.