Unified Shell: Increase Header Height

Does anyone have any suggestions on how to increase the header height of the sap.ui.unified.Shell control while (1) increasing the height of the header's controls and (2) preserving the fit of its' content, a Component containing a sap.m.SplitApp?

I've tried modifying CSS by inspecting elements as well as extending the Shell control (custom aggregation for sap.m.FlexBox control, modifying the renderer, etc). I created a Plunk for an example.

Hopefully I'm overlooking something simple,

Scott