I would say nearly impossible (basically impossible to keep balanced but i won't say totally impossible)
I actually work for a company that makes plastic auto fans.
The best you could do would be to trim them in a lathe. Even then I think you'd have a tough time. those fans are often made from nylon with glass fibber or mineral fillers for strength which makes them very brittle if you're lucky it is made from polypropylene but not likely. but that would also have glass or mineral fillers
Might be easier to go to a pick-and-pull junk yard (auto or tractor) and find a smaller fan that would work.
someone asked why the blades aren't evenly spaced: =its for noise reduction
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