Now that MainHUD.Character is blocked...
 

Would it be possible to make a custom window that pulled the same data sources so we can see that info again?

No, the xml is hardcoded, you cannot put it anywhere but the mainhud_character.xml file.

Let's in game feedback and get this back.

It's very odd how they updated the window then removed access to it.
Could it be that they "broke it" like the merchant window or have they officially posted on this?