The Ladybird bowser - part of the Serenity OS - is another alternative I’m following with a mixture of astonishment, admiration and excitement - https://awesomekling.github.io/Ladybird-a-new-cross-platform...

I suspect that for most people, it still has a way to go before it could be considered a daily driver, but the rate of progress is incredible and I’m sure it will get there.

What is the easiest way to use Ladybird?

You have to build from source. The repo is here [0]; there is a link to build instructions in the README. It is still experimental, but has an active community working on it.