Remove template type from templated class

I have this structure:

template <typename T>
using AllSettings = std::variant<
    A<T>,
    B<T>,
    C<T>,
    D<T>
>;

template typename<T>
void Foo() {
    using SettingClassT = std::variant_alternative_t<0, AllSettings<T>>;

    //....
}

is it possible to obtain base class without <T> from the SettingClassT? Something like this:

template <typename T>
using SettingClassBase = ... somehow remove T from SettingClassT

Because I need to call other template method that expects base type and T type separatelly.

template <template<class> class Base, typename T>
void Bar() { }

so I can call:

Bar<SettingClassBase, T>();