Polar melting and the equator
An interesting question! I suggest you do some 'slightly complex' calculations. Look up the angular momentum of the whole Earth. Then calculate pM.dF where pM is the additional angular momentum from the melted ice, redistributed as a function of latitudinal angular momentum. dF is differential redistribution caused by continent-ocean constraints. I'm confident that you will find that the additional differential off-axis angular momentum will be miniscule compared to the total. There will of course be some effect upon the Earth's spin axis, but this will be just another of the small catalogue of mass distribution effects which contributes to a somewhat chaotic wobble in the Earth's spin axis, which is typically in the order of a meter or two. When global warming gets worse and huge masses of ice /water are redistributed, then I'm guessing that the effect could be orders of magnitude more - tens or hundreds of metres maybe? Also consider that the Earth behaves like a gyroscope, so much of the additional angular momentum will exhibit as rotation around other axes, much as hurricanes rotate in the atmosphere.