Is triple quantum important in Sparkle teams?

I don't have any quantum support for the third slot (Tribbie, SW or Cipher), so i'm using Ruan Mei. And since i didn't want to lose the boost on Sparkle's atk buff, i decided to pick a quantum sustain, but the only options are Fuxuan and Lynx...

Neither of them seem to be able to handle long difficult fights (Especially Fuxuan without her light cone), so i wanted to know if you guys think it would be worth to lose some of Sparkle's buff and Fuxuan's 15% crit rate, in exchange for a more reliable sustain (Gallagher/Aventurine/Huohuo)