Add new supported culture (Hebrew)

I’m trying to make a game that supports Hebrew as a selectable language. I’m using Localization macros (LOCTEXT) and the Localization Dashboard, but in the “Add new cultures” menu it doesn’t display Hebrew as an option. I even manually modified DefaultEditor.ini to have

SupportedCulturesStatistics=((CultureName="en"),(CultureName="he_IL"))

It doesn’t display the culture name properly but it does add the appropriate folders/files when gathering text/counting translations/compiling.
However when I switch the current culture to he_IL it doesn’t work, stays in English. I also see when packaging you have to select what to cook, and once again Hebrew isn’t an option.

If I understand the Engine’s code properly, it uses a 3rd party tool called icu4c, correct? Their website indicates it natively supports Hebrew (and other right-to-left- languages). Why doesn’t Unreal support it? Is there something I can fiddle with so that it does?

Thanks

Work in progress: I managed to get Hebrew to be a recognized culture by adding all of the “he.res” references from Engine\Content\Internationalization\All\ to Engine\Content\Internationalization\icudt53l. It now correctly displays “Hebrew” in the Localization Dashboard as one of the cultures I’m translating, and the translation editor works fine. However I still can’t

  1. Pick Hebrew from the list of available cultures in the Localization Dashboard or Packaging Settings menu
  2. Most importantly, display hebrew text. All characters appear as the same image (see screenshot below). This is true in the Editor and in the game itself.