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William.
If it's the same bcd could you swap chainrings?
9 speed has inner ring slightly over to the outside so the thinner chain can climb onto the big ring. This is the potential issue if you run a 8 speed chain in that it might rub when using the inner ring as 8 speed has slightly wider plates in its links, though irl it's normally fine.
If it does rub you could use a 9spd chain - I've done this with a 9spd fsa chainset friction shifting over a 7spd block with no issues. However if you're using indexed shifters I imagine it might make shifting at the back a bit tardy.