The present work is dedicated to advancing Arbitrary Lagrangian-Eulerian (ALE) methods for complex flow simulations involving moving boundaries, particularly in the case of very large displacements. The paper presents a novel formulation of a fully nonlinear fictitious structural problem for ALE mesh motion. This method combines the robustness of existing techniques with enhanced computational efficiency. By avoiding global system inversions, the approach ensures high performance and scalability. The study investigates the implementation of this formulation within the TrioCFD open-source software, utilizing a hyperbolic equation to address the mesh motion problem. The proposed strategy features a flexible material behaviour interface, which minimizes the need for additional coding. Demonstrations and validations, including tests on adherence to the GCL, on complex geometric configurations and extreme mesh distortions, highlight the effectiveness of the approach in terms of both physical solution quality and mesh integrity.