Just to manage expectations a bit, what this would get you is the attention of potentially large numbers of NPCs, but it would not put them “at your disposal”.
As the number of NPCs it’s feasible to interact with and as they become more valuable, we will almost certainly start making them harder to lead. With a huge number of survivors at large, why are they going to follow you?
Most games treat the PC as “the chosen one”, but DDA does not. Nowhere is this difference going to be more stark than in interacting with other survivors. You need to prove, and continue to prove that you’re worthy of leading. Most games either ignore or only pay lip service to this kind of thing, but DDA NPCs are going to be a lot more demanding than you probably expect. If they aren’t fed, safe, entertained, and maybe even inspired, you won’t be able to keep good NPCs around.