Make sure you're not in aggro distance before you start, quickly turn into Saurian before Furina's Salon Members reach Cocijo so you won't trigger its aggro. When refreshing Furina's skill make sure you don't have a Salon Members active nor anything that is dealing dmg against Cocijo.

The turtle aggros if Furina's summons deal damage to it when you are not in the saurian form. Try re-summoning a bit further away only after the summons run out, and walk back closer in the saurian form.

I can confirm, you need to wait for Furina's summons to disappear before you can re-summon them again, otherwise the turtle will notice you. When you get out of the Saurian form, don't move from the position, just let Furina get out and use her skill again, then go back into the Saurian. I must stress that you need to wait for the summons to run out, not just for her skill to be available again. Wait until the summons disappear from the screen before doing this again. Rinse and repeat until it's dead. It's going to take a few minutes so be patient.

It took 4 and half minutes. It could've been a bit faster if I had used burst with Furina at the start.

Build is at 5:38. Jiyan has his Signature Weapon, others do not.

Bennett's C6 turns the active character's Swords/Polearm/Claymore into Pyro Infusion. Bennett infused with Pyro make him get overloads with standard ICD(every 2.5s) with NAs in conjunction of ES and EB. These Electro Lectors also sucks up Energy so Bennett being the active character at that moment also keeps his Energy Fueled up due to him absorbing every Pyro particle on top that.

Chevreuse is perfect for this team and can surprass Bennett's spot for Yoimiya's damage output, unfortunately she needs to be C6 for that to happen. Luckily, with C0 Chevreuse being inferior boost for Yoimiya she's still on par on C6 Bennett as she also debuffs both Pyro AND Electro, so Fischl also gets a huge impact on that team :)