I was actually against this until I started to seriously think about it,
1. We can potentially see Gordon's homelife and possibly Barbara Gordon development for seasons before becoming Batgirl in a movie.
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2. We don't need Pattinson to have Batman appearances from the GCPD's perspective
This is what a show with a likely lower budget could do with that direction
and that was literally a guy just wearing this
3. we could see something like Montoya going from a rookie cop to eventually detective and then to The Question which a movie would never give time to
4. Considering Clayface will never be a movie's big bad they could do him here or even the Ethan Bennett version
Now we have
- the guy responsible for the Batman franchise atm involved (meaning he can set aside characters he doesn't want in movies or to give others development they wouldn't have time for in a movie)
- Gordon's movie actor well established on HBO as is
-a set continuity linking these adaptations
- Pattinson's stuntman
- the batsuits and stuntsuits from the movie
- the batmobile and batcycle from the movie
- a legitimate budget(most likely)
They could literally have stuff like a police chase with Batman from the GCPD's perspective and they'd have everything they needed for it