This was my first thought (quite close to Jim's):
(def the-maps [{:key 3 :value 30} {:key 4 :value 40}])
(def mandatory-keys [1 2 3 4 5])
(defn find-missing-keys [maps keys]
(let [found (into #{} (map :key maps))]
(remove #(contains? found %) keys)))
(defn ensure-mandatory-keys [maps]
(let [missing (find-missing-keys maps mandatory-keys)]
(sort-by :key (reduce (fn [result key]
(conj result {:key key :value nil}))
maps
missing))))
(ensure-mandatory-keys the-maps)
;; ({:key 1, :value nil}
;; {:key 2, :value nil}
;; {:key 3, :value 30}
;; {:key 4, :value 40}
;; {:key 5, :value nil})
- John
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