Is Firefly worth it at E0S0 for my account?

Hello, with Firefly getting Novaflare I’ve become interested in pulling her. I just pulled SW999 and I’m a bit low on pulls but I reckon with anniversary rewards I can get to pity at least one more time and at least try to get her, so I’d probably only be able to afford E0S0 (with Herta LC) unless I get extremely lucky.

I’m also interested because I actually have many break supports but I’ve been using them with Rappa. I have:

E1S1 Fugue

E0S1 Dahlia

E6S5 (DDD or Memories) HMC

E1S1 Ruan Mei

E6S5 (MoC LC) Gallagher

Is Firefly meta even at 1 cost investment with these teammates? And what would be the best sustainless and sustain team I can make? I’ve heard she’s less reliant on Fugue than other Break DPS and sometimes prefers HMC or Ruan Mei (or both if sustainless) over Fugue, but maybe Fugue being E1 changes that? I’d appreciate some tips, thanks!