The digitalisation of Non-Destructive Testing (NDT) data is critical for the preservation of heritage assets under environmental stress. This paper presents the technical development of a digital demonstrator for the British Academy-funded project BLUE-HeArTS (BLUE Heritage through Art, Technology, and Science), which connects scientific monitoring with artistic and historic educational narratives. The study focuses on the Reculver Towers medieval church and Roman Fort site in Kent, UK, a heritage site highly vulnerable to coastal erosion. To integrate complex, multi-modal data, a three-dimensional (3D) digital model was engineered in Unity. This digitalisation process combines high-resolution 3D laser scans of the towers and surrounding topography with surface-related remote sensing datasets, including the Normalized Difference Vegetation Index (NDVI) and Land Surface Temperature (LST) maps. Additionally, the model integrates subsurface NDT data, specifically topographically corrected Ground Penetrating Radar (GPR) data, to visualise the structural integrity of sea defence areas. By digitalising these diverse datasets, ranging from electromagnetic subsurface profiles to thermal surface maps, into a single immersive environment, the system supports a holistic representation of climate-driven risks. To assess technical viability, performance was evaluated using established geospatial Extended Reality metrics. This formed the basis for frame rate profiling across different hardware configurations, including Quest 2 and 3, to measure real-time rendering efficiency. Computational efficiency was further analysed through GPU and CPU utilisation during dynamic data toggling. The performance analysis corroborates that rendering complexity remains a primary bottleneck, causing GPU overload and dropped frame rates. This study establishes a technical foundation for heritage and environment conservation digitalisation, highlighting the need for rendering optimisation.