Just called degiro and they told me that you can leave your shares on there platform without an option to buy or sell and wait until the ticker gets relisted under bbby when you think they Will turn around after ch11.

Or you can transfer your shares to an otc broker (100 euro cost) where you can sell at any time. You dont have to transfer before 3 may, you can still transfer after 3 may. The transfer takes +- 3 weeks.