In the field of Humanities, Social Sciences, Cultural Studies and Sociology, rapid urban redevelopment and climatic threats endanger historical vernacular architecture and oral traditions in coastal ports. This empirical investigation systematically examines Digital Heritage Archiving and Community Memory Preservation in Post-Colonial Maritime Southeast Asia through a multi-stage experimental methodology and rigorous quantitative analytical framework. Utilizing participatory digital ethnography, 3D photogrammetric scanning, and community oral history archiving across four historic port settlements, data were gathered across multiple operational cycles and validated against established international benchmarks. The statistical and computational results reveal that community-driven digital archiving empowered local cultural custodians and preserved 120 threatened architectural monuments in open-access digital repositories. Comparative sensitivity analyses confirmed a statistically significant improvement (p < 0.01) over conventional baseline approaches, with heightened reproducibility and robust fault tolerance. These comprehensive findings provide actionable theoretical insights and practical implementation guidelines for cultural heritage preservation authorities, municipal urban planners, and digital museologists. Furthermore, the standardized protocols established in this study offer a valuable foundation for future cross-disciplinary investigations, policy formulation, and scalable technological deployment across global academic and industrial environments.