Most anybody reading this thread will have no issues using SD Protect if they want to.  You simply use a Fat32 formatted micro SD and create a small file on the card using trezorctl and the commands Forsyth Jones placed above this post.  Couldn't be any easier.   Like all files it is easy to copy off and save the file from the SD card and encrypt it somewhere so you always have a backup.

I literally wipe (not simply delete) my file from the SD card and write it back the next time I use my Trezor.  Seconds to do in both directions, but I have shell scripts on Desktop that does it in a blink.  Again, its a very small file.