Think twice.
Bitcoin is like a prisoner's money in that case. It means that you have to report every single address to the authorities, for them to decide how long you hold.
Are you always going to be in control in such environment?
Discussion
As long as you can prove that you owned it for 12 months before selling you're fine -> After 12 months send it to a whirlpool etc. to brake the link and then start spending when needed ✌️
👀 Are you sure?
Mixing just means new address for approx same btc amount. Isn't that a new obtained Bitcoin to the tax office?
What is a taxable event? Holding btc for 12m and a day? Doubt it.
I'd say it's spending it after at least 12 months. But what if you spend it partly?
Taxation is not a simple theft but advanced game where you lose the most.
After 12 months you can do whatever you want without reporting. That's at least what I know. But I'm not an expert as I'm personally not affected ✌️