Probably there's very little point to this other than learning how to build a browser right now.

I don't see this catching up any time soon to a point where you could use this and not deal with a very broken browsing experience. So this will likely stay a bit of a niche thing for quite some time. But I'm happy for people to prove me wrong.

Easy to forget that Webkit started out as a fork of Khtml when Apple embraced it for Safari. Later Google forked it off as Chrome. So, it has been done before. But it's a lot of work.