The basic abstraction that I see, is that you need a function that
will replace a range within a collection with another collection.

Here's a quick and dirty way of doing that:

(defn assoc-range [v min max v2]
  (vec (concat
         (take min v)
         v2
         (nthnext v (dec max)))))

So calling:
(assoc-range [0 1 2 3 4] 2 4 ["a" "b"])

returns:
[0 1 "a" "b" 3 4]

So now you can write your original code as this:
(assoc-range a-vector k (- (count a-vector) k)
  (map modify-element a-vector))

This should be quite a bit faster than your original code. And is a
little cleaner in my opinion.

Hope that helps
  -Patrick

PS: And perhaps you can find a more elegant way of writing assoc-
range. Mine is a little smelly.

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