Hi! First time making a thread here.
In V5, it is stated that thin bloods can diablerize their way into one of the 13 clans, and this may be even part of your character's story in bloodlines 2. It is also stated that the Camarilla may sometimes sanction a diablerie during a blood hunt. Now imagine that a thin blood performed a 'sanctioned' diablerie, and that this fact is publicly known by the kindred of a city.

For clans that are less structured such as brujah, gangrel or Malkavian, I can see them being accepted into the fold more or less readily. Maybe some Lasombra would...