Research in design and HCI is investigating the role of design interventions in adding value to the quality of life of people with dementia. However, the sustainable use of design interventions in care environments remains challenging due to the complex values and needs of all involved stakeholders. In this paper, we present the results of two workshops with stakeholders from practice, academia, and policy organizations in dementia care, which revealed initial insights into the requirements for implementing design interventions in care facilities. In total, 21 participants explored the criteria to implement Vita, an interactive sound cushion in a dementia care home from the perspective of an entrepreneur, a relative, and a professional caregiver. The workshop outcomes indicate that sustainable design interventions in healthcare settings need to be: 1) directly available in the care space; 2) stimulated and supported by care organizations; and 3) come with clear information and personal guidance.