Forcing Autoflowers

Can Autoflower plants be forced into Bloom with 12 / 12 light cycle and bloom nutrients?

No they can not. Depending on strain some will flower in a an average set number of days or at a certain size. This is totally dependent on the strain. It is almost as if from seed to death they are programmed to live for only so many days, if you mess up and stunt early growth with not enough light or not enough room for roots and they become root bound, growth will be stunted and the end yield will be significantly reduced.