Here, we propose a method to introduce the magnon orbital Nernst effect in twisted collinear magnets through broken spatial inversion symmetry. We demonstrate that nonzero Berry curvature and orbital moments of magnons can be achieved by atomic translation, including spin-polarized transport of magnon orbital moments inherent to altermagnets. Based on first-principles calculations, we predict a potential bilayer structure of $\mathrm{VSeBr}$ exhibiting tunable transport properties. The magnetic ground state determined by the stacking orders, can be switched between altermagnetic and ferromagnetic phases, thereby enabling spin-polarized currents. Our work reveals perspectives for controlling spin-polarized magnon orbital currents based on layered magnetic structures.

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• Spin waves
• Spintronics
• Altermagnets
• First-principles calculations