If you use unit management, there is no way to circumvent the need for an extra axis to display a dataset with an physically incompatible unit. But you can decide not to display it. Just disable the drawing of Division Labeling, Axis Labeling and remove the checkmarks on the Appearance page of the axis’ property dialog.
When you don’t want to benefit from the automatic scaling and unit calculation features, you may add the desired labelings manually to the desired axis.
