IF the cameo is to be done, maybe we could add suggestions as to where it could go:

If we were to be filmed, then naturally it would have to be a background character, such as one of the imperial pit officers, or one of the rebels somewhere in the control room, back somewhere in the hanger bay or even in the trench. Not that it would be done, but if humor is a factor, the cameo could possibly be the person behind Admiral Ozzel who turns to look at the body, looks up to see Vader and quickly turns back to working at his post (I always found that a little humorous for some reason).

If a still image was to be used, then a face on an ID or even a brief face shot on one of the background snowspeeder pilots before or during getting shot down could be used.

Or better still, the cameo could be as a stormtrooper! Of course, with the mask on it would be hard to see your face, but maybe a voice cameo could be worked with as well.