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Firstly, the situation is not entirely hypothetical - these circumstances have occurred in reality before with varying outcomes and a more generalized case involving similar issues is something that is actually on the radar of missionary trainers and supporters (cf. this on-line article).
The Biblical issues that I see at play in a situation like this are:
The relative importance of these principles and how they would play out in a real-world scenario would not only vary from denomination to denomination, but almost certainly from individual to individual - to attempt anything more perscriptive would be a pharisaical extreme.