If you have good enough performers, unfamiliarity with the language won't get in the way.
It might seem a bold assertion, but there's a reason that classically-trained Shakespearian actors are often cast in sci-fi shows (Patrick Stewart and Ian McKellen as perhaps the most famous examples). They're trained to convey more information through intonation and gesture so that you don't need to know the words they're saying, which translates well to performances in invented languages.
It might seem a bold assertion, but there's a reason that classically-trained Shakespearian actors are often cast in sci-fi shows (Patrick Stewart and Ian McKellen as perhaps the most famous examples). They're trained to convey more information through intonation and gesture so that you don't need to know the words they're saying, which translates well to performances in invented languages.