HI Alexmartin,
I think that having your wealth in stocks/funds/assets does not protect it. The government can introduce a tax on assets just as easily as they can on bank deposits. The pension levy and the property tax are evidence of this.
The bottom line is that if you have wealth of any type, the government can introduce a levy/tax on it, in my opinion.
I do not see that moving your wealth to another asset class or even another country avoid this. Short of emigrating, I think there is no way to avoid this.