I gone through a lot of hosting service providers and unfortunetly cannot find a single one that can be used without running nonfree programs, all of them require loading bulky obfuscated JavaScript apps.
I know of Codeberg Pages for static sites for example, but it is not suitable for any business or professional use.
No reputable registrar requires you to run an executable on your machine. JavaScript is as far as it’ll get.
I’m sure many registrars work without JS, but if I had to be sure of any one in particular, it’d be Njalla. They even have an onion site and accept monero, so they almost certainly function without JS.