AutoCAD Inventor :: Putting A Sketch Into Assembly

What I have is a sketch of a hole.  The hole has a flattened side to prevent the part from rotating.  What I want to be able to do is to put this "part" (an ipt file with just the sketch in it) on any surface of any case, top, left, right, bottom, or even the front or back.  So it needs to rotate 90 degrees in x, y or z or combination thereof.

I've been told several things by the local assistants, such as "copy it, place it on the desired plane in the .ipt file, delete the original sketch, then insert it into the assembly", which doesn't work, or use the Component>Rotate command, which gives me infinite degrees of freedom, making it hard to tell when I've rotated 90 degrees in the correct axis.

The sketch will be used in a number of assemblies, including machined aluminum, 3D printing, and laser-cut acrylic. 

In essence, I want to place this sketch flat on a surface, then extrude "To" the other side of the surface.  I want the flat edge of this sketch (the side that keeps the part that will be inserted in the hole from rotating) constrained to be parallel to one of the edges.  I have looked around a lot through the documentation and several other Web sites, and there does not seem to be an answer to this.

The sketch is simple: a circle with a flattened side, so if that sketch needs to be discarded, it is no major "expense" to me in effort.  But given my projected series of projects, creating reusable drawings is going to be important.  So how should I be thinking of this?