No, the Nismo works on the stock system because it is designed to run on low voltage, and not draw too much current for the stock wiring when doing so. Try running a Walbro 255 on stock cruise voltages and you will find it doesn't last very long.
Personally I run twin 255's for that very reason, more flow for less current, but they are not ethanol rated. These days I would be dropping an e85 460 in, as I am doing to my evo this week.
Running the stock pump with an inline after it is a good idea, but you would need to match the sizes of the pumps. No way a little 20 year old oem stock pump will flow enough to keep up with a decent inline, and that would cause all sorts of problems.