Best alternative for a $100k stablecoin to BTC swap on Tangem?

My good friend must swap roughly $100,000 USD value of stablecoins into Bitcoin. The funds are presently sitting safely in a Tangem Wallet.

After learning concerning the horrific compliance traps and long-term fund freezing on third-party on the spot swap apps like Changelly, we are absolutely not using them or any integrated provider that may set off a surprise KYC lock mid-swap.

What is the most secure method to execute a swap of this measurement immediately from cold storage?

If we go the DEX route by way of WalletConnect (e.g., 1inch/Uniswap), what's one of the simplest ways to move from a wrapped asset like WBTC to native BTC safely?

If we choose a serious centralized trade (like Kraken or Binance), do their OTC desks deal with these transitions easily without flagging exterior hardware pockets deposits?

In search of secure, non-custodial ideas or platforms with deep liquidity that gained't maintain funds hostage