The Design and Engineering Methodology for Organizations (DEMO) offers a comprehensive framework for modelling an organization’s structure and operations in a coherent and platform-independent manner. However, criticisms have arisen regarding the complexity of DEMO models, hindering their accessibility to non-experts. Our research team has been working on refining the DEMO Modelling language for Enterprise Ontology. Drawing from previous studies, which identified challenges in using standard DEMO notations, this research introduces new representations tailored for improved communication and validation of models. Through a case study in the healthcare domain, involving domain professionals, the efficacy of these new representations is evaluated. The findings reveal significant disparities in perceived quality and functionality between traditional DEMO representations and the newly proposed ones, with a clear preference for the latter. Furthermore, the paper presents advancements in the development of a metamodel for DEMO’s Action Model, leveraging an Extended Backus-Naur Form (EBNF) syntax. These developments were informed by the implementation of a system supporting the aforementioned case study on a no-code/low-code platform. In essence, this research strives to streamline DEMO Modelling, making it more accessible, comprehensible, and practical for a wider range of users and applications, while also advancing its technical foundations for enhanced implementation support. Moreover, this study underscores the importance of user-centric approaches in refining modelling languages, especially in complex domains such as healthcare. The contributions include concrete models and patterns derived from this implementation, offering reusable solutions for similar scenarios, facilitating their adoption by other low-code platforms following a similar approach.