Static Shock - I would say Dope meets the Raimi era Spider-Man with a splash of Atlanta from FX.
Black Lightning & the Outsiders - I would take ques from the latest iteration of the Batman and the Outsiders book and have Jeff lead the team. however, I would subtract Batman from the equation and use elements from the Black Lightning TV show to make Black Lightning the central focus (especially the Freeland setting) and have him build the team; then have Batman come in at the end to help set up a possible sequel where they face off with Markovia.
Martian Manhunter - I want a focus on him as a sorta cosmic detective/p.i. with some Lovecraftian cosmic horror elements.
Blood Syndicate - Milestone properties would be a perfect i.p farm for movies if they were still around. my take on the Blood Syndicate would be like Luke Cage meets Atlanta meets the Warriors (1979) with some Fruitvale Station or Snowfall elements for good measure. I'd focus on Wise-son as our central character and Holocaust as his primary villain .
I'm using a loose interpretation of "stand alone" in the sense they'll stand alone from the extended DCEU (with the exception of BL & the Outsiders at the end)