[Frank the Tank]

Nothing exists to do what you are after. A gas fireplace is "sealed" (the glass fronts are removable for cleaning) due to the carbon monoxide produced. Also, if you have a gas fireplace, you have a gas line running into it, so burning wood in the same space would be bad. Open flame, gas line....well, I am sure you get the idea.

As far as a good insert goes, the Marquis line from Kingsman, based out of Winnipeg are very well made, versatile and affordable inserts. They make one called the Cappella, which has many options as far as logs vs. stones, trim colours and whatnot. Worth checking out.