Each of the big theories of modern physics have a somewhat more "classical" equivalent, that is
- The Lorentz aether theory for special relativity
- The Bohm theory for quantum mechanics
- Pauli-Fierz theory for general relativity (the non-linear version of it, anyway)
I'm not 100% sure that they all agree 100% with all modern experiments (in particular the Lorentz aether theory was designed with electromagnetism in mind and might not work out with other fields), but they have the benefit of agreeing with the other theory at least as far as science was concerned when they were abandonned.
Can these theories work together in a decent facsimile of modern theories? That is, is it possible to define general relativity as a tensor field theory acting on some Lorentz aether, QFT as a Bohm-type theory on the Lorentz aether, and so forth? Or has this line of thinking never been explored due to being incredibly stupid?