I really like the 3PO translation stuff just the way it is. I explained my thoughts in another thread, so I’ll just copypaste them here:
I personally like C-3PO knowing exactly what it says but being unable to tell them. I find it funny in the right way - it brings them tantalisingly close to their goal, which still remains maddeningly just out of reach. I really feel their frustration in that moment, but it’s tempered with the dash of humour which keeps it enjoyable.
For me personally, it feels just like the kind of weirdly slightly-self-contradicting idea that the OT, in particular ANH, threw out all the time.