Here is my two cents for when this gets attention again:
If possible, look into Gecko to see if it has any advantages, since WebKit on Linux isn't as good as it is on Apple devices. Honestly, I'd like to avoid Chromium, even if it is ungoogled Chromium.
Additionally, if Kagi Search could finance the browser, that would be a huge win. Personally, I wouldn't pay for a browser if I'm already paying for the search engine. As a poor college student, I cannot justify $15 plus tax per month for both a browser and a search engine, especially when open-source and private browsers already exist. I justify paying for search because, as a software developer, my job is basically to be a professional searcher.