Here's a pass using reduce, keeping both collections in the return value,
conj-ing to one and taking from the other as necessary...
(defn nil-coalesce [coll subs]
(first (reduce (fn [[a b] x]
(if x
[(conj a x) b]
[(conj a (first b)) (rest b)]))
[[] subs] coll)))
user> (nil-coalesce [nil 1 2 3 nil nil] [4 5])
[4 1 2 3 5 nil]
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