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The NP29 is a 1911 single stack clone. Any .22 conversion kit for a 1911 should work. My suggestion would be the GRG ( Should be GSG ) unit. Well built & the price is good.
I dont think a conversion slide will work with the 9mm ejector. I have a .45 and 9mm norinco and the slides do not interchange until i switch ejectors. Dont know if it makes a difference for the .22 kit but if it says it is for a gov style 1911 it might not work with your 9mm. I would ask the manufacturer. If not its a good excuse to buy another gun