Sure, as long as one has some means of predicting the probability of false positives as well as false negatives. Until then, colour me unconvinced of the (f)utility of this approach :)
No problem marking them as machine translated and keeping track of which have been spot-checked by experts either.
Indeed, one of the thing you'd probably like the translators to do is identify rare or unique words that can be added to our existing knowledge of these languages.
It would be really neat to set up something like a wiki populated with the existing translations and machine translations done via LLM, and to periodically re-train the LLM on all the newly manually verified translations and automatically re-run the machine translations after. The whole thing could move incrementally toward high quality output.