Thanks for the quick and friendly reply!
For 2) that's actually an interesting idea to swap material and thus also shader, that would actually fix that issue!
For 3) that's also a good idea, I will try to do this. Basically you mean with the <size> tag I can force a font size and thus "force" the relative size to always be absolute? That's kinda genius, I will try that.
I must admit I couldn't sit still so I started working on a "sub-system" which will basically tokenize and split text into elements and layouting. It splits the text into objects and wraps them automatically cause that way I can maybe use my own image components in the middle of text.