Why not just sell the professional version with an other name and give it an extra website which shows how powerfull it is and how many posibilities it provides, but not "Games authoring never was easier".
From there you could then link to the 3DGS main page and point out that there are also other editions available.

But basicly I think you shouldn´t try to denie which engine you are using, but to make people getting a "better" impression of 3DGS through some really outstanding projects. If such projects aren´t possible, 3DGS is just what it seems to be to people without really knowing it (just probably not as easy as they think).

This is what I thought when reading this topic