You can definitely use a keyed axle! To do do that you'll need to find a donor kart or you'll be buying a lot of parts for it to work. Spiderbox stock axles are weak, so you'd be up-grading a potential future issue.I don't know a build for your GY6 engine. I'd wait and see if you even have an alignment issue.
If you get stuck with the swap let us know.
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