To my knowledge there is absolutely no way to change the EQ2 cursor. It's something folks have been asking for for eons, so best you can do is /feedback and hope they get to it after the expansion.
Another suggestion to /feedback for would be something like a global UI_scale variable that would just rescale all UI elements. That'd certainly make it easier than what you have to do, since you have to go through and change all the various windows.
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