Got what I want, but had to give up this approach :(

Instead of adding more css-classes, I just added a label to the
HeadersToolbar, to switch the ordering state via css background-image and
doing my checks for grouptotals in HeadersToolbar.onConfigure() where an
sumup-symbol is added as the new labels DataModelObject.

Never forget your umbrella ! In case You did, try to find a shelter ;)
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