After doing some research on flywheels for the 7A (pretty much only found 1ZZ/2ZZ flywheels), I came across a Corolla forum that said the 4AFE flywheels are a direct swap into the 7A crank. After a bit more research, I found this flywheel on Matrix Garage.
Sidenote, great website to start research and buy components on a 7AGE build...
They aren't specific on the material of the flywheel, so I decided to wait until the holidays passed before contacting them. Though, I suspect it's constructed from chromoly since it's only ~8lb and I don't see any strikingly steel plates for friction material.
Any of you guys have experience with these flywheels?