Providing a default hreflang for translations

[Brando16]

I've been doing a lot of research on hreflang and had a question regarding the implementation with location targeting. I have a translation for Brazilian Portuguese, I'd like to target Brazil with this translation on my site but also provide it as the default for other users that speak Portuguese outside of Brazil. Can I use the same translation for two different sites? So my hreflang would look like this:

So in this example the pt-br and pt sites would be duplicates but with one being specifically targeted to Brazil and the other for all other people speaking Portuguese anywhere else in the world. The default language of the site is English so the full implementation would look like this: