I do believe your scenario is plausible. Honestly, the Superman vs. Batman debate is stale, but I agree it is possible and even likely that Batman could win in a sneak attack.
However, Batman could never win in a straight up head to head battle. Even with Kryptonie, Superman could just keep his distance and fry him with heat vision or though a skyscraper on top of him.
Yup, eggxactly. For some reason people can't even accept that.and both elevate Superman to god status by cherrypicking his powers, from random issues where they are grossly exaggerated.
Head to head battle, no contest. If Batman knows Superman is coming, then it's possible for him to have the advantage and win.