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

My good friend needs to swap roughly $100,000 USD value of stablecoins into Bitcoin. The funds are at present sitting safely in a Tangem Pockets.

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

What's the most secure approach to execute a swap of this measurement instantly from cold storage?

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

If we choose a serious centralized change (like Kraken or Binance), do their OTC desks handle these transitions smoothly without flagging external hardware wallet deposits?

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