AutoCAD Inventor :: A Global Transient Geometry Object?

I've found myself using this code often:
 
// Get the transient geometry object. We'll use this to create pure geometryCComPtr<TransientGeometry> pTrGeom;pTrGeom = pApp->TransientGeometry;
 
But I was thinking, once I have pTrGeom can I just declare a global to hold it while my Inventor instance is running?

Alternatively I suppose I could have a global function which does this:
 
CComPtr<TransientGeometry> GetTransientGeometryPtr(){ static CComPtr<TransientGeometry> pTrGeom = NULL ;
if (pTrGeom == NULL) pTrGeom = pApp->TransientGeometry; return (pTrGeom) ;}
 
So it reduces to a one-liner. But in COM is that static valid? I know the code is not complete above, but you get the idea.

What do other C++ COM programmers do here...?