https://forum.square-enix.com/ffxiv/...-revamp-theory.

I made a SCH revamp of my own targeting exactly this many years back.

The core of the idea was to have Eos doing the lifting but with there being a gauge cost to leaning on her. Meanwhile a 2 minute CD was there in place of dissipation to emphasise bringing in Selene briefly for a burst of DPS buffs before switching back to Eos.

In hindsight, the numbers would have needed to be tuned quite a lot vs what I've listed, but I still think the mechanics of my suggestion are sound even today.