This is pretty much exactly how I feel about the matchup as well. Batman can obviously zone extremely well, but as you said, the chip taken to close the gap isn't a huge deal. In neutral, if Batman doesn't have a bat out he gets out footsied hard, and Bane's amazing anti-airs should keep him grounded. Even with bats out, Bane gains meter like crazy, so why not push block them out and avoid the hassle of having a big hitbox vs BM's J2.
This is one matchup where Bane needs to conserve his venom, and patiently walk Batman into the corner. There isn't any need to pop venom while trying to get in, force Batman to guess for the full 21 seconds of venom once you do. Once knocked down, especially in the corner, what the hell is Batman supposed to do? By is 2-3 low chance guesses from his lifebar being gone. I understand parry is an option but I see no reason to not just use D1 for oki. It's still a shitty guessing game for Batman, and full punishes any puny slide attempts.
I hope the meta of the matchup continues to evolve, it's still a very fun cat and mouse style matchup to play!