Have you tried Orion? From the Kagi search team, it allows you to install both chrome and Firefox extensions including uBlock Origin. Still uses WebKit for rendering of course.
My lattes are still cheaper than a Kagi subscription though.
Edit: interesting, they don't even show what the "Orion+ subscription" costs if you don't make a Kagi account.
https://kagi.com/orion/orionplus.html
I'm not going to read all the material when I'm not interested in subscription based software anyway.
Lifetime plan allows you to own your browser, without subscriptions.