The increasing presence of interactive technologies in children's lives has led to the need for effective evaluation methods to assess their user experience. While various UX assessment tools exist, their applicability to children remains a challenge, particularly in terms of comprehension, engagement, and reliability. Teachers’ opinions may provide crucial insights into the effectiveness and usability of different UX assessment methods, yet their role in shaping these tools has often been overlooked. Through a co-design process involving 30 preschool and primary school teachers, this research refines 3 existing and 1 novel UX assessment tools to make them more suitable for evaluating children's emotional responses to interactive experiences. By doing so, this research contributes to the development of more accessible and reliable UX evaluation methodologies that can be tested and validated in future studies directly involving children.