Works here. You should click validate twice:
- Once on the small window whose title is "Choose a font"
- Then on the main preferences window whose title is "LXTerminal"
Then your setting for this user will be stored in ~/.config/lxterminal/lxterminal.conf
There is no need to use a script for that. Also, the font used is not a console font as the X server uses other fonts than the Linux console.
But bear in mind that this is a per user setting, so it won't hold for
another regular user.