The following resources may be of interest:
A simple to navigate overview of road safety measures https://www.trafficchoices.co.uk/index.shtml
Guidance on implementing Traffic Management Orders for part-time street closure. http://schoolstreets.org.uk/
Implementing cycling safety measures in 10 days. Loads of examples of temporary cycling measures. https://mobycon.com/wp-content/uploads/2020/05/FrKr-Berlin_Guide-EN.pdf
Examples of safety measures for cyclists https://twitter.com/davidmckenna18?lang=en
Three presentations on safety measures from leading UK experts https://www.climateemergency.uk/blog/re-allocating-road-space-for-cycling-and-walking/
Guide on how to make quick changes to street design http://www.udg.org.uk/content/fast-urban-change-how-guide
Guidance on temporary safety measures https://streetspirit.design/f/seven-design-principles-for-pop-up-highway-infrastructure