Allo!
For a specific project, I needed to create a lot of multi-style text. And to be honest, it's just painful to do it manually every time. So I decided to create an object to do it for me, because I don't want to do it manually anymore 
This one calculates the position of each group of text automatically and will save me a lot of dev time now.
I called it "MultiStyleText" and the source code is available on github if you want: https://github.com/tleunen/pixi-multistyle-text
I'm pretty sure there are a few bugs in there, especially with styles using different font-size. But this is a start
I've released it as 0.1.0 because I'm not sure yet of the way to create it, with the 2 "styles" object. Feel free to suggest improvements on that!
I put an example using the same that Mat created for Pixi.Text and here is the result:
Let me know what you think.