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Imho extra compressed air tank also will add complexity, mounting difficulty and mass.
For it to be effective for longer boost time it needs to be big/heavy to hold more air volume at higher pressures (=probably in boot, like air suspension tanks, not under hood with no place for it and possible heat soak issues from nearby hot engine) + extra air tube routing. Compressor for it will need to be optimised for high pressure, i guess speed/volume of air compressed may suffer, thus longer times w/o boost, while it's getting pumped up. And costs.
Nah .. keep things simple, and most probably feasible is something like phantom ESC, tried and true solution/kit of compressor/controller/battery pack. Yes, only mild boost, but small size/simple retrofit/simpler design & make/reasonable price. Power & torque will still be more then with NA. Though that is also pro, as it won't require strengthening of engine internals/clutch/transmission. For those, to whom it's not enough, there are already tried & true classic SC/turbo setups.
ESC has it niche. Trying with it to outperform or perform on par with classic forced induction ways may eliminate it's strengths of simplicity/ease of retrofitting/lower costs. One can make pickup truck to perform well on track by extensive modding, but should one? Own niche product with own set of pros & cons, that will do best if used within that niche.
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