You can apply a heatmap at the panel level, then alter the colours at the column level as has been suggested by other answers. Then if you want it to apply to all columns (without any hardcoded names) you simply need to remove the field property from the color palette tag in the source xml. the absence of a field property means apply to all. Of course it may apply to other columns as well (including your key columns... maybe set another one with the key column name specified to override this) change <format type="color" field="yourfield">
<colorPalette type="minMidMax" maxColor="#006D9C" minColor="#FFFFFF"></colorPalette>
<scale type="minMidMax"></scale>
</format> to... <format type="color">
<colorPalette type="minMidMax" maxColor="#006D9C" minColor="#FFFFFF"></colorPalette>
<scale type="minMidMax"></scale>
</format>
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