central planning is not incompatible to democratic concesus, central planing of economy is orthogonal to society's method of rule.
No, I don't think that the central planning of economy can be made independent of a government system in the society. Really, how could you force people to accept what they should eat and wear if there would be no authoritarian rule that would tell them what they should think and say in the first place?
Otherwise, you should show how you could foretell every individual's whimsy and fancy in respect to their economic decisions
central planing is not about what consumers should consume, its about what producers should produce... the current system is dictating consumers what to consume.