Mike Stearns said:
You really need a Gene Roddenberry for this to work...
There is just no conceivable way Gene makes a "dark" Batman series.
What you want are Rod Serling & Harlan Ellison. Ideally, you'd have an Executive Producer who was a fan of GA Bats (pre-Robin).
You couldn't do an "HBO 'Batman'" in the '60s, with him explicitly throwing people off rooves & seeing the splat, but implicitly, yes.
You need to have producers realize there's an audience of Bats fans who've grown up with him, & many who've served in the armed forces, who've seen worse than anything TV will allow. So, think "EC Batman".