The 1:1 claim was easier accomplished through a signed message and I was hoping that the 1/2 : 1 claim worked the same. That different method was the reason why I did not do the 2nd (50%) claim in November.
Also, there's now another way to send BTX with Trezor, using a special version of Electrum, which is probably easier.
Look at
https://bitcore.cc/claim-hw.php