Prune or Kazuha for Varka

I've heard that c2 prune is right around where she starts to replace Venti in a varka comp, but I'm not sure if that includes his weapon, or nicole. Either way, I'm not sure how that translates for Kazuha (C2) vs a c0 Prune wihtout Nicole. I can't decide whether its worth it for me to pull for Prune to replace Kazuha in my Varka comp.
For reference, my Varka comp:

Varka c0 w/ thousand suns r1
Durin c0 w/ Mistsplitter r1
Bennett c6 w/ aquila r5
Kazuha c2 r1

Something else that I should take into account is that I'm sitting at 73 pity no guarantees saving for Nuev 2.0, so if I try getting the C0 prune, Theres a chance I end up with Nicole too. If I had Nicole replace bennett, would that change the C0 Prune vs C2 Kazuha?
Thank you!