Default time zone to personal for all users at global/site level

Hello,

I have a SharePoint site that is utilized all over the world. I know that we have the ability to Default time zones by adjusting the regional settings under the site settings. But what I am needing is for time zones to appear user specific. 

After some digging, I found you can manually perform this adjustment by going to your profile, navigating to personal language and region settings and checking the box for "Always use my personal settings". This would then override the site regional time zone setting.

Which is great, but I am looking to perform this at a global level. I do not want to send a message asking for 2000 people to manually adjust this setting on their profile. How can we achieve this from an admin level?

thanks,

Jake