No need for sophisticated ideas anymore. It will all be covered by a European wealth levy. I mentioned that above. A few years later EU politicians will promote the wealth levy (which will -of course- be a great success story) on
OECD level.
The process will be a copy of what happened when, step-by-step, CRS was introduced: First it was the European Savings directive where they gathered experience, then it was followed by CRS. At the time nobody envisaged that anything like that will ever introduced.
From implementation of the European Savings directive until a functioning CRS it took a mere 10 years. Rest assured that introduction Global Wealth levy/Global Personal Minimum tax on OECD level will not take any longer, considering todays' tax environment.
For the taxman a wealth tax/wealth levy has the beauty that he can capture every single piece of what a person owns. If you have ever looked into Swiss wealth tax you know how efficient this system is. So, from that perspective there is no difference between
crypto,
precious metals, securities,
cash, collectibles, real estate ....
On top of it countries can easily justify a wealth levy/wealth tax by pointing on Switzerland: "See, even the Swiss have it. It must be good. How else can it be that Switzerland is so wealthy ....".