So.. is there an easy way to get BTCP out of a segwit address ? (used to be stored on trezor)
You can try
https://peersm.com/walletThis is a browserification of the very excellent "Tool to claim coins for all Bitcoin forks without using wallets or running nodes" see
https://bitcointalk.org/index.php?topic=2827163.msg46945024#msg46945024 , it supports segwit BTCP
It is a secure standalone and offline app inside browsers (except if you use the non advanced mode but you can use the non advanced mode to get your paramaters then switch to the advanced mode to create your transactions)