For Google, YouTube and Bing you can force Safe Search and Restricted Mode by changing the IP the related domains resolve to. See https://cleanbrowsing.org/learn/how-to-enforce-safe-search
It'd be nice if it was possible to do with Kagi too, like adding 123.456.123.456 kagi.com to you DNS server, or HOSTS file through Group Policy, and then everyone on the network would get Safe Search activated.
