I can't discern the difference between 'unrealistic ideal' and 'doable?'. Is it suggesting that the former is not achievable?
I suspect there is untapped potential in the underbody. Consider the M-hull boat. It has a needle nose and barge boards that capture the bow wave, provide lift and reduce the wake dramatically.
Lower the stagnation point, widen the barge boards into wheel pontoons* and add a diverging diffuser; and it turns into an untried and unproven ground vehicle concept. Yer welcome.
edit:
For clarity, the wheel pontoon would have a flat outer face, and an inner simple curve into the throat. The needle nose would have a compound curve to induce the vortexes the M-hull employs. The belled exit could be simple or compound curved.
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* The belly pan does add 'skin' which was formerly turbulence, and a turbulent boundary layer will form on it's bottom, which does, to some degree 'choke' the flow as it grows larger and larger the further downstream.
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This is why Cal-look VWs have a rake. The underbody diverges from the front torsion bar.
It's possible that a perforated pan could turn the underbody (or parts of it) into a semi-permeable membrane that would make the underbody a resonant cavity. There's a CFD thesis in there.