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I believe this question is only answerable if $F_k$ is easily invertible. In other words, if you can compute $M=F^{-1}_k(F_k(M))$. Then a standard meet-in-the-middle attack applies. Given message $M$, ciphertext $C = E_k(M)$ for unknown $k \in \{0,1\}^{128}$, an efficiently-computable function $X$ such that $k = X(k_1, k_2)$ for some $k_1, k_2 \in ...

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