I would not have any problem with someone translating who is not a member of the Church. The recommend questions have been published as a result of the talk President Nelson gave during his
Closing Remarks at general conference in October 2019.
The questions are in LCR. To get a copy of them, the bishop could call up that page and then change the language to Vietnamese. He could allow the interpreter to read them there, or he could print the page for the interpreter. I would destroy the printed copy after the interview.
Another way would be to go to the general conference talk (linked above), change the language code to Vietnamese, and then read or print them from there. This would run the risk of not having the latest changes in case there have been any recent changes to the questions.
EDIT: Here is a direct link to the Vietnamese translation of the talk by President Nelson.
https://www.churchofjesuschrist.org/stu ... n?lang=vie