Would like to see Forms move away from JS and use Blazor "Razor Components" or at least have the option.
Have you posted this in the Feature Request forum?
Having overridden pretty much all of the forms UI on previous projects I'll warn you that it's not a quick or particularly simple task but the option is certainly there.
I'm not so much concerned about the UI, but the JS comminications between the Client and Server. As I understand it, when switching off JS for Forms, a lot of finctionality is lost. Blazor could be used to replace this using WebAssembly. It's pretty neat because WebAssembly is browser independent.