The market determines the risk, not the asset owner. The owner has no special knowledge of what the risk actually is separate from the market pricing it. You explicitly want them to accurately price it outside of a market, which is effectively impossible, ignoring that the price is highly fluid and dynamic.

If the owner is required to invent a fake risk premium then it virtually guarantees that the risk will be mis-priced. Forced rampant mis-pricing is an exploitable arbitrage opportunity of epic proportions. Every quant worth a damn will make a fortune looting this. No serious policy can ignore this defect. It has the additional political downside that no one can ever own anything anymore in a meaningful way, which won’t be popular.

No one takes this idea seriously because anyone with a modicum of finance math background can see that the math doesn’t math. Political ideology doesn’t even figure into it.