Larynx with non-profile language

I try to get larynx working with a language other than the profile language (profile: de, larynx: en-us), however i can not get it to work. I downloaded the language models via an profile:en start and copied them to the tts/larynx folder. Additionally, i tried to change the profile.json larynx entry with lang/language/locale: “en-us” as well as using the lang argument for mqtt hermes say calls, but nothing seems to work. Can anyone tell me how to get this working?