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amey-
Unless you're doing CX, nah.
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You could do it without. Maybe need a chain catcher on the inside. But often it works without.
I am building something similar. 1x8 speed. But I opt for a used 104bcd square taper chainset instead. This made it possible to get narrow wide chainrings for less than 20gbp. I went for the on one, but ebay has other brands as well.I will ride mine offroad as well as city. If you won't do that, you can live without narrow wide I bet.
edscoble
Hulsroy
Actually found this, seemed apt and come with chainguard.