We theoretically introduce a quasi one dimensional magnetic heterostructure of alternating 2D topological and normal insulator strips. Such a structure can be realized by special fabrication techniques or may emerge naturally in twisted bilayers of certain transition metal dichalcogenides. Its low-energy physics is governed by a hybrid Hamiltonian intertwining the Su-Schrieffer-Heeger and Shockley models, with spin-momentum locking and local Zeeman splitting. Symmetry analysis places it in class AIII, characterized by chiral symmetry and a $\mathbb{Z}$ topological invariant. Computing the winding number from the block-off-diagonal structure of the Hamiltonian reveals topological phases characterized by invariants $\nu =0$, $1$, and $2$. Furthermore, a single magnetic defect acts as a sensitive local probe, whose in-gap spectrum provides a spectroscopic fingerprint to distinguish global topological phases. We show that the frequency-dependent optical absorption induced by such a defect exhibits distinct features in the topological and trivial phases, offering an independent, experimentally accessible local indicator of the global topological order. Extending the platform to a multilayer geometry uncovers a non-symmorphic projective symmetry that gives rise to Möbius band topology.