Any AC coming too close to modern times, especially with guns being prevalent seems alien to me. Blackflag or AC3 is the closest to me they should get to because rifles needed to be charged, and I can envision an Assassin getting the drop on their ennemies by being quick enough.
But if we're not getting goofy with stuff like blade versus guns, how a little hidden blade is supposed to make sense and being relevant against guns ? The internal logic of such an organisation would be moronic and visually, they need to change so much the core pillar gameplay of AC that it basically be an Hitman game to make sense.