Teflon or PTFESome have reported using Lithium grease for over a year without issues. The water content might be an issue over time but you're probably not looking at years of service on the gears anyway.
https://www.machinedesign.com/motors-drives/article/21831576/engineering-essentials-lubrication-tips-for-plastic-gears-and-more-part-2 https://www.motioncontroltips.com/plastic-gears/ https://www.geartechnology.com/articles/0993/Lubricants_and_Lubrication_of_Plastic_Gears/With handy compatibility charts https://ecllube.com/resources-for-engineers/tutorials/ECL_Tips%20on%20Lubricating%20Plastics.pdf
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