This is relevant, T-34M production was scheduled to begin only a few months after Barbarossa.
The flame thrower seems to me a terrible idea. Flame throwers belong in dedicated tanks for very specific uses. On a gun tank they're just an extra fuel tank to worry about. The 57mm tanks would be probably meant as "hunter killers" for AT use. If they were worried against close in defence against infantry, a few grenade dischargers would have done the trick.