Look, these types of scenarios are best run by an immigration attorney, not on AVVO.
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The short answer is, no, the job in and of itself wouldn't pose a problem as long as you meet all of the other requirements and it's, as you say, short term. It's best to speak with an immigration attorney, however, to review all the possible scenarios including whether you would even need an N-470.
Disclaimer: This answer is for informational purposes and does not take the place of a consultation with an experienced immigration attorney. This answer does not create an attorney-client relationship.
I would recommend consulting with an immigration attorney regarding the risks involved with a green card holder leaving the United States before becoming a citizen.
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