Designing robust control protocols for multipartite entanglement is a central challenge for quantum technologies. We introduce a measurement-free collision-model protocol for preparing symmetric Dicke states $|D_n^{(m)}⟩$ using excitation-preserving partial-SWAP interactions between two qubit registers and $m$ shuttle qubits that remain part of the final state. The intra-register and shuttle–register collision strengths are treated as control parameters and optimized using a multi-start L-BFGS-B procedure. This extends collision-based entanglement generation beyond the single-excitation W-state sector without projective measurement or postselection. We assess the protocol under missed collisions, coherent crosstalk, independent and correlated dephasing, depolarization, and amplitude damping, and additionally quantify sensitivity to uncertainty in the assumed noise parameters. For the finite Dicke-state family studied here, optimized collision strengths preserve high preparation fidelities over broad imperfection ranges. These results provide a physically transparent framework for measurement-free Dicke-state preparation in repeated-interaction architectures.