I just tried this out. Besides the fact that it doesn’t stream and translates after speech is done, it’s absolutely fantastic. Of course, it would suffer in accuracy if it were translating a stream so I think that’s a plus instead of a minus, although some people might not think so.

This one of my most used apps at the moment, it works 100% on your device and is great for filling in search terms, for AI prompts , messages etc. The only downside is that it seems to have a character limit so it may not be what OP is looking for.