The discipline of human factors and ergonomics is largely focused on principled development of generalizable solutions. The process is typically slow, spanning months, even years. A crisis such as the COVID-19 pandemic presents a different problem. How can human factors and ergonomics professionals react quickly, within hours or days, to provide viable solutions to unanticipated problems as they become apparent? Here we report on a small project in which we were able to respond rapidly to an emergent COVID-19 requirement. Given time constraints, we had no opportunity to follow a systematic analysis and design strategy. Our development and testing strategies reveal lessons that can be applied more generally to development of human factors and ergonomics interventions within emerging crises.