I believe the only "drop in" is Kato Unitrak, which costs an arm and a leg, and is difficult to mate to other brands.
The only Atlas N track with metal frogs is their code 55 line, which in my opinion is excellent in terms of appearance, operation and economy.
If you're sticking with c-80, then Peco Electrofrogs would be your choice, but I'm not sure how you would wire them in a double crossover situation. You'd probably want the medium radius (about a #6). You'll have to check which crossing track would work with them.
Personally, I avoid such complex track arrangements, as they are usually more trouble than they're worth, in terms of cost, complexity, and function. Sometimes they're unavoidable, but the real railroads didn't like things like that much either...
Lee
