I'm going to leave you to calculate the aether out yourself if you want to know with certainty, but intuitively I don't like your potential unless you start getting, say, 140 lift per battle (double Eir + two light-blessed units).
You might also find this helpful. I've found some errors in the calculations, but for a general sense of how hard it is to move up, it will do the job.
https://fireemblem.gamepress.gg/q-a/how-ar-uses-aether-consumption-manage-tiers-and-which-tier-youre-likely-sit
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