Yes, you can. However you MUST ensure that it is securely fixed, unlikely to come loose (note that normal screws might not suffice, most bolts on wings are into captive nuts as less likely to come undone), and that no screws, etc. are protruding or are likely to create a hazard to anyone that might come into contact with the bodywork.
However, I'd suggest asking a local independent bodyshop what they'd charge for taking off the old wing and putting a new one on properly, and then judge whether it's worth all your time and effort in doing it yourself
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