Maybe attach a small paint pad/sponge to a stick that's long enough to reach to the base? Or remove and dip into a large vat of paint.
I have an extra standing in the attic. I know how much it weighs and I'm not dipping it into anything. Sponge on a stick sounds like it's worth a try and less messy than spraypaint.
Was kidding about the dip.
@JesperXT started
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Maybe attach a small paint pad/sponge to a stick that's long enough to reach to the base?
Or remove and dip into a large vat of paint.