This ended up being a lot more trouble than it was worth. I don't think I'd recommend doing this when 30%-0% was already the easiest part of previous magna light solos and getting there was both quicker and easier.
I'm actually at a loss as to why this was so difficult compared to previous light solos - not having some healing summon calls and damage passives and 30% defense up from Blessed Wedding shouldn't be making this much of a difference, but every attempt with both Monk and Doctor with four grid Qilins was an edge of seat life or death struggle and almost none of them were even getting to the range where the boss could be beamed down.
The high turn count from running magna x magna without crit in the grid was definitely part of the problem, but the alternative of going in with ~55k HP felt even worse; characters were practically getting 1-shot all the time even with no Trance stacks and the potion supply just wasn't healing enough. An extra 16k max HP is an extra ~10k healing per green pot, which adds up over the course of a raid with a dozen of them.
Monk really should have been better since it can run Lucifer main summon and still have enough dispels for 50%, and it comes with extra damage during the Qilin blast phase from Mantra and having a nuke, but not dying was a major issue there, too, and I don't know what to make of it. It certainly wasn't a problem when I recorded that 12 minute kill.
Pressing Cagliostro 2 as a panic button adds an extra complication; Noa needs to get killed off by an ougi to swap Fraux in since there's no hostility redirect, and if he revives, that gives Beelzebub an extra heal. There ended up being a bit of overkill, but starting from anything past 32% or so probably is a bust since Noa dying heals 20m (2.8%), and taking turns to finish the last couple of percent is risky even with Fraux guarding.
Uptime on Aglovale 1's buffs are important. Both delays and gravity need the debuff accuracy up, and overlapping Nutrients with the revitalize goes a long way to keeping the team alive.
Noa gets extra credit for trying to throw at the last possible moment dodging on the turn he was supposed to die. The ougi the ensuing turn could have killed Aglovale through guard.