1. Not that I know of by that method. The theoretical OG can be pretty easily calculated if you provide the ingredients, quantity thereof, and the size of the batch (how much went into the fermenter).
2. Can't speak to the specifics but likely the flavor won't be as clean and crisp as one would expect from a lager.
Drinking: Store bought
Primary: American Amber Ale
Next Up: Dark Lager
Conditioning: Scottish Wee Heavy