An early xmas present: 6.1 kernel

[wibble]

You should be able to resize the encrypted partition(s) but you'll need to boot from SD to do it as you can't do it while the partition is mounted. I'm assuming it's using LUKS rather than native filesystem encryption. Its a multi-step process as the partition management tools don't yet handle it natively, but it can be done, and there are plenty of tutorials around.