You can write your own EnsureOrigin implementation:

struct EnsureAuthority<T>(core::marker::PhantomData<T>);

impl<T> EnsureOrigin<T::RuntimeOrigin> for EnsureAuthority<T> 
where
   T: Config,
   T::RuntimeOrigin: Into<Result<RawOrigin<T::AccountId>, T::RuntimeOrigin>> + From<RawOrigin<T::AccountId>,
{
    type Success = ();
    fn try_origin(o: T::RuntimeOrigin) -> Result<Self::Success, O> {
        match o.clone().into()? {
             RawOrigin::Signed(s) if Authority::<T>::get().map_or(false, |a| a == s) => Ok(()),
             r => Err(r.into()),
        }
    }

    #[cfg(feature = "runtime-benchmarks")]
    fn try_successful_origin() -> Result<T::RuntimeOrigin, ()> {
        Ok(Authority::<T>::get().ok_or(())?)
    }
}

You can write your own EnsureOrigin implementation:

struct EnsureAuthority<T>(core::marker::PhantomData<T>);

impl<T> EnsureOrigin<T::RuntimeOrigin> for EnsureAuthority<T> 
where
   T: Config,
   T::RuntimeOrigin: Into<Result<RawOrigin<T::AccountId>, T::RuntimeOrigin>> + From<RawOrigin<T::AccountId>,
{
    type Success = ();
    fn try_origin(o: T::RuntimeOrigin) -> Result<Self::Success, O> {
        match o.clone().into()? {
             RawOrigin::Signed(s) if Authority::<T>::get().map_or(false, |a| a == s) => Ok(()),
             r => Err(r.into()),
        }
    }

    #[cfg(feature = "runtime-benchmarks")]
    fn try_successful_origin() -> Result<T::RuntimeOrigin, ()> {
        Ok(Authority::<T>::get().ok_or(())?)
    }
}