Double Skadi

Literally anyone with a Quick NP

In the near future during the new Valentine's event, MHX Alter is a good single target candidate. You can also try to get Okita during the Guda Guda rerun.

Berserker Tamamo Cat is also decent, in the future she will get a 1-turn debuff immunity so you will be able to clear at least 2 waves.

I mean you basically named *the* quick meme supports already. If you want to meme 3 turn farming with just one servant, get np3+ Dantes with double Skadi and NP every turn using his overcharge and their 50% battery each. Atalante at high np levels is a decent option as well.

Quite a lot of them and if you only care about grinding stuff easily, for destruction and damage, it's Zerkerlot. Dantes is good with double Skadi and with double Skadi Zerkerlot become an even more powerful force than before.
Zerkerlot also can switch team between Quick memes ( post-Skadi ) and Buster memes ( for now and later ), so you're well prepared if you already have him on your Chaldea.

Zerker 1,5 bonus damage to lots of classes + 1.1 damage modifier + high base atk stat. Outside farming, he can also act as a Crit Zerker and he can hit like a freaking truck.
For grinding, Zerkerlot is one of the best or a no-brainer pick for your Quick team.

The strongest and team cores : Skadi, Waver, Merlin.
VIP Quick members : Atalanta, Achilles, Ishtar, Parvati, Bradamante, Scathach Assassin.
Honorable mentions : Marie, Astolfo, Medusa, Alexander, Fuuma, Tamacat.

For Quick Meta, if you get one Skadi and one Zerkerlot or NP 2 ++ Dantes or another Quick VIP members then just smooth sailing everythings.
I admire your dedications, best of luck !

Bonus : ARRRTTHHUURRRRRRR !!!!!!!