Dynamically generating a reify clause using macros

Question

I am trying to wrap an implementation and dynamically generate the reify clause for all the interfaces the wrapped object implements.

For example:

I want to generate:

(reify
  BaseInterface
    (fee [_] (custom-operation wrapped))
    (foo [_] (.foo wrapped)))

or

(reify
  BaseInterface
    (fee [_] (custom-operation wrapped))
    (foo [_] (.foo wrapped))
  AnotherInterface
    (bar [_] (.bar wrapped)))

depending on whether wrapped implements only BaseInterface or both BaseInterface and AnotherInterface.

I tried something like the following, but it fails as the macro is evaluated at compile time and my second argument (the cond-> expression) doesn't have its runtime value:

(defmacro add-interface-implementations
  "Adds additional interface implementations to a reify expression.
   This is useful to create a reify expression dynamically without introducing if-else branching."
  [reify-expr interface->methods]
  (reduce
    (fn [expr# entry#]
      (println "expr#" expr#)
      (println "entry#" entry#)
      (let [[interface# body#] entry#]
        (cons
          (first expr#)
          (cons interface#
                (reduce
                  (fn [e# m#]
                    (cons m# e#))
                  (rest expr#)
                  body#)))))
    reify-expr
    interface->methods))

(add-interface-implementations
  (reify
    BaseInterface
      (fee [_] (custom-operation wrapped))
      (foo [_] (.foo wrapped)))
  (cond-> {}
    (instance? AnotherInterface foo)
    (assoc AnotherInterface [(bar [_] (.bar wrapped))])))

Any suggestions on how to achieve what I'm trying. I want avoid the if-else branching as it leads to combinatorial explosion as soon as I have more interfaces.