Can I just chime in to explain how I use Kagi on macOS and iOS.
Before I found out about Kagi, I started using Keyword Search: "Safari Keyword Search is a simple extension for Safari on macOS and iOS that lets you change the default search engine and search using any search engine using keywords in the address bar. For example, you can search Wikipedia for information on monkeys by typing w monkeys in the address bar."
Let me make clear that I am in no way affiliated with the developer, I am only a very satisfied user.
When I became a Kagi user, I also added the k for Kagi search.
In a later version Keyword Search added a Default toggle. Meaning, that if no keyword is given in the search bar, that keyword is being used. This way I had no need for the Kagi extension.
Definitely worth my 99 cents (looking into my archive, I noticed the extension was free, not sure if it still is).
PS: if this kind of feedback is inappropriate, please do delete.
PPS: I did not yet find out how to use Keyword search in combination with the Search token.