In the US, I think multiple transactions of $9K to avoid a $10K reporting threshold would be illegal:

https://en.wikipedia.org/wiki/Structuring

Yes it’s called ‘structuring’ or smirking and is variously restricted in many places since it’s an obvious on-ramp to money laundering and tax evasion.

The point is that the face value of the coins counts for the limit, not the value when you sell those coins.