Lilim builds are not really feasible. The 90% sounds high, but really all it does is bring your team back to up to par from losing two on-element Hime. In other words, you basically lose your Eidolon slot for it.
So, I'd say keep rerolling for 100%.Everything is feasible, but sounds like something that'd cause a burnout more than anything. Kamihime is a marathon more than anything.