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Let $\mathfrak{g}$ be a complex simple Lie algebra and $U_qL\mathfrak{g}$ thecorresponding quantum affine algebra. We construct a functor ${}^{\theta}{\sfF}$ between finite-dimensional modules over a quantum symmetric pair of affinetype $U_q\mathfrak{k}\subset U_qL{\mathfrak{g}}$ and an orientifold KLR algebraarising from a framed quiver with a contravariant involution, providing aboundary analogue of Kang-Kashiwara-Kim-Oh generalized Schur-Weyl duality. Withrespect to their construction, our combinatorial model is further enriched withthe poles of a trigonometric K-matrix intertwining the action of$U_q\mathfrak{k}$ on finite-dimensional $U_qL{\mathfrak{g}}$-modules. Byconstruction, ${}^{\theta}{\sf F}$ is naturally compatible with theKang-Kashiwara-Kim-Oh functor in that, while the latter is a functor ofmonoidal categories, ${}^{\theta}{\sf F}$ is a functor of module categories.Relying on a suitable isomorphism \`a la Brundan-Kleshchev-Rouquier, we provethat ${}^{\theta}{\sf F}$ recovers the Schur-Weyl dualities due toFan-Lai-Li-Luo-Wang-Watanabe in quasi-split type $\sf AIII$.

Generalized Schur-Weyl dualities for quantum affine symmetric pairs and orientifold KLR algebras