isn't that pretty much her default built? it's not like she has much other uses - although I'd probably go with an ER set depending on your artifacts and team setup since her burst is pretty expensive.
I just slapped my spare exile pieces on her with a healing head (can use one of the prayers too) because fuck artifact grinding. scholar would probably work as well, but harder to get.
*laughs in zonghli with range dps*
those two fights were faster than some commissions (or wait till you do the leyline on a small af island spawning ruin sentinels) with an upgraded yanfei/fischl, the main issue is that it's fatui, and when you bring the wrong chars and/or don't nuke them fast enough in the right order it can become tedious real quick. but at that point I'd expect people to know that and how to handle them, and the questline involves fatui pretty early so you know what you're dealing with.
as for the timegating, my first reflex was to be mildly annoyed too, but then I remembered that the game isn't brimming with content after the rush to clear the new stuff, 2/3 of it was simply doing another quest after my daily commissions/resin run (and you're right next to it to collect conches anyway). there's also more timegated stuff, when most people are done with it the next event should be up.
imo it was more annoyed that they both released a new event (which didn't really have anything to do with the story) and new land mass at the same time, I rather focus on exploring stuff at my own pace instead of being forced to run to points all over the map, not to mention the mandatory quest line and character filler quests they incorporated to pad it, I prefer to save that stuff for later when there's nothing to do anyway.