Ah, Mori provides a few useful functions for updating nested structures - update_in and assoc_in.
In the simple little project where I used mori, I did this:
const {
get,
conj,
js_to_clj: map,
clj_to_js: pretty
} = mori;
But I bet you lose a surprisingly large number of JS devs due to just having the "wrong" names. Maybe I should publish a camel-case-mori module on npm...I can't imagine changing the cljs compiler or adding a piece to mori that must be maintained is important enough for this. I'd imagine Swannodette's answer would be "you should use ClojureScript anyway" :)
[1] -- https://github.com/swannodette/mori/blob/master/src/mori.clj...