CME options on bitcoin futures are not available at IB but options on MSTR are available. This is a proxy for bitcoin as they have issued convertible bonds and bought bitcoin. See Michael Saylor on YouTube. He is on every crypto channel.
Open an account at tradestation crypto and then transfer securities from IB there. Either sell the securities and buy crypto or buy on margin.
Otherwise trade CME or Bakkt Bitcoin futures at IB. Also microstrategy stock and options are a bitcoin proxy as well as gbtc.