The easiest Super Recollection from Lostbelt 3: Li Shuwen will help you rotate your supports even if your MC is not available, with only his random Taunt as something to work around (but since it’s treated as debuff, just using Castoria NP will solve the problem).
Here is the detailed script for the battle if you want to understand the reasons behind my teambuilding and actions during the fight: it’s a bit messy since I wrote it in my native language only for my personal use (like a stream of consciousness really) and now I translated it very quickly.
********** SANZANG SETUP *********
- TURN 1: On the first turn you need an arts crit to recharge Sanzang NP bar (and guarantee the kill with minimum RNG). Since you have a star bomb and gather rate up buff (thanks to Crane) you shouldn't have any problems getting a crit.
After breaking it on the first turn Li Shuwen could use one of his two skills: the one with debuff immunity is not a problem, instead pay attention to the ignore invincibility with 100% crit damage buff which bypasses Crane invincibility and could kill Sanzang or Koyan with a total 150% crit damage buff (100% from the skill, 50% from the break bar), however Sanzang NP at overcharge 2 reduces his crit rate by 90% compensating for the (two times) 100% crit rate up he receives on break, so he only has a 40% total crit rate (30% is his default value without skills).
- TURN 2: Sanzang kills with NP only, but she must charge her NP bar for next turn. She needs any two of her cards (except the Buster and Quick combo) to refill enough or obviously an arts crit. Here the taunt is only on Koyan who should always die with 3 attacks given all the enemy's buffs and her health already lowered.
Since Sanzang NP reduces Li Shuwen's crit rate to zero he has difficulty killing your supports, he always must attack the same one three times to kill, so it is important that the taunt stays on Koyan: therefore, I’ve put a CE with debuff immunity on Merlin so that Li Shuwen can’t land the Taunt on him (counted as a debuff), leaving only a 1/3 chance of him targeting Sanzang as problematic.
- TURN 3: guaranteed kill with NP only (no CE needed on Oberon to buff the team's buster obviously, I only wanted to show off with big numbers here)
********** VLAD SETUP *********
- TURN 1: If you use Castoria bond CE (with Golden Carp CE for star bomb & charge on a Crane with lored append) one arts from Vlad is enough to refund (no crit needed) and he practically always kills (at minimum RNG you can leave Li Shuwen with 4k hp).
If you use a star bomb CE on Castoria (because you can’t use a Crane with lored append) then you need an arts crit from Vlad to avoid using Reines' defensive skill the next turn (instead you have to use it with a normal arts from Vlad to charge him enough): also you have slightly less damage so small RNG to kill (but with an arts crit you always kill!).
- TURN 2: Vlad kills and refunds enough with NP only (no damage or card RNG).
There is no need to use Reines def skill to charge Vlad (since this way she will surely die with the taunt having class disadvantage) if you scored a critical with Vlad the turn before or if Vlad was attacked by Li Shuwen charging his NP bar.
With Castoria NP you can remove Li Shuwen’s random taunt if needed (when Reines or Castoria won’t die), since it is treated as a debuff: in any case it is a taunt with a weight of 600% while Poster Girl CE taunt has a weight of 1000% (the skills of Crane and Sanzang have 300% weight just to say, while Outrage CE has 100% weight).
PS: Oberon skills and Castoria NP are overkill, so even if no support died with the taunt, if you managed to refill Vlad NP bar (with arts crit for example) you could still kill the next turn (using Castoria's NP guarantees the kill the next turn)
- TURN 3: guaranteed kill with NP only (Castoria NP would be enough of a buff without bringing Oberon)
********** MELT SETUP *********
I can’t use Miss Crane since I can’t unlock Melt's mana loading, having already unlocked the one buffing her extra attack: consequently, I don't have the NP charge needed to use her NP on turn 1 even with the new charge skill for Melt.
- TURN 1: to always guarantee the kill you need two Melt cards (brave chain) with at least one Quick or Buster crit (4 of her cards out of 5). If you get a Quick card (even without crit) or an Arts crit you will refund enough for the next turn even without using her skill 1 (charge), which you can instead use on turn 1 to guarantee the crits by filling the field with stars.
Note that with any of her cards (besides her NP) Melt will refund enough if you save her charge skill for the next turn (even with her Buster thanks to Koyan!)
- TURN 2: Melt will kill with minimum RNG with any brave chain or with just a single crit. To refund enough you need either two among her cards (any brave chain), a quick crit, an arts or to put an arts support card before NP Melt with one Melt quick or arts at the end of the chain (no needs for crit, but that way the kill is not guaranteed, even if I repeat it’s minimum RNG).
Li Shuwen's random taunt is treated as a debuff so it can fail on Melt and Skadi who have high magic resistance: in any case it’s a taunt with a weight of 600% while Poster Girl CE has a weight of 1000%, so Reines is likely to die anyway given that only one attack is enough to oneshot her (given her class disadvantage)
- TURN 3: guaranteed kill with NP only