Can I "scale up" the output of geoshow()

I'm doing plots of satellite passes on a 3D globe with axesm('mapprojection','globe') using geoshow(). Also use geoshow('landareas.shp') to display continents. On top of those plots I need to show the day/night terminator (where it's night and day). In 3D, that's a hemisphere - also plotted as a set of polygons via geoshow().

Problem is that the day/night terminator hemisphere polygons intersect with the land area polygons. In some places land is on top of terminator. In other places it's (correctly) underneath.

Is there a way to push my day/night terminator geoshow() output slightly away from the surface of the globe so that it does not intersect with land areas?

Thanks.