I'd say your best chance at doing that would be to find a dynamic speaker that has nearly full range out of a single drive element. And one who's drive element has exceptionally low mass and also has a very strong magnetic drive motor.
There are some drive elements that are made primarily for low power SET systems that come close to this equation, although none will actually equal the electrostat for speed.
There are some drive elements that are made primarily for low power SET systems that come close to this equation, although none will actually equal the electrostat for speed.