Preventive maintenance and adaptive reuse are critical approaches to preserving cultural heritage, ensuring the sustainability and functionality of buildings. Heritage Building Information Modeling (HBIM) integrates these approaches through digital modeling, allowing the recording of geometric, historical and material characteristics. This facilitates the analysis of the condition of buildings and the planning of maintenance, reducing the risk of deterioration. The addition of Digital Twin technology to HBIM enhances the application of these approaches, creating a virtual replica of the physical building that is updated in real time through IoT sensors. This dynamic update allows architects to design realistic scenarios and simulate the impacts of interventions. In addition, extended reality (XR) technologies and Gaussian splatting offer new possibilities for visualization and interaction with HBIM Digital Twin data. Through XR technology, users are immersed in 3D virtual or augmented environments, interacting with the data of the cultural building, with the possibility of remote collaboration. Gaussian splatting allows for a more realistic representation of the data than traditional methods such as photogrammetry, facilitating the understanding of the relationships and details of the buildings. This collaboration offers an integrated approach to the challenges of conservation and reuse of cultural heritage, as well as new study extensions towards an interdisciplinary tool for designing reversible architectural interventions in cultural heritage buildings.