Ya'know there was a time when a player could escape from Praetoria before level 20, but that exploit was patched. The way the game identifies your alignment, even if you manage to zone in to Atlas Park or Grandville, you get forcibly booted back to your previous zone. Same applies in situations like Precinct Five for non-Praetorians.
The good news is there are still plenty of holes throughout Praetoria that allow you to "escape" under the map 😁