A few years ago I attended the macna where Charles Delbeek was giving some info on Nautilis husbandry
Yep, they ain't easy to keep
He has unlimited resources and he had many issues with them
Although, he did show us video of a smaller pygmy type that was readily eating from tongs
They stress easy, stop eating, and dong live that long
If you know the exact type you , you should contact him
He is on Facebook too
Good luck