I came across BR during my studies as a typographic designer. There was a language problem there.
That's why I realized that reading and listening are completely different. You can understand a language by listening to it. But reading the same language does not mean that you can understand it.
I can't imagine this working too well with German words ? e.g. how much of Rechtsschutzversicherungsgesellschaften, Kraftfahrzeughaftpflichtversicherung, Lebensabschnittpartner or Donaudampfschiffahrtsgesellschaftskapitän would you need to highlight ?
I don't speak German, but surely with compound words, your concept doesn't work that well ?
Even just a couple days ago I came across “Personalisierungsinfrastrukturkomponente“ [0] in a news article, so it is not just a rumor that Germans like long-ass words :)
[0] Apparently these are the devices used by the government to verify passports and / or fingerprints of refugees.