What your asking for is a cork/bio seven.
A flatspin is just a "reverse" cork, the spin/flip happen in the reverse order (if you don't get what I mean, a flatspin initiates with a flipping rotation and ends in a spin to truely get back on axis, and a cork starts with spinning and ends with a "cork 3" or a "cork 5" flip/rotation to get back on axis.) so if you spin all the way through a "flatspin" you just wind up with a cork/bio seven depending on how you throw it.
That is my understanding of the tricks, feel free to correct/comment, I'm not trying to start a shit storm here.