This is the only true way to do it.

You would need to remove the “record” that you hold Bitcoin. Even if you mix/coinjoin/obfuscate your KYC’d sats, the centralized record still shows your original purchase.

If you sell it, your stack is “gone”.

You’ll lose some fiat to exchange rates and fees, but this is the way to convert a stack.

Or you can stack KYC-free in a separate wallet, side by side.