setxkbmap -layout us,gr -variant euro -option 'grp:alt_shift_toggle,grp_led:scroll'
this command will set dual layout US Greek with Euro sign.
Putting it on Session autostart does not work since its overwritten by the bugged xfce layout,
so I made a launcher and I use it once per session when I need the 2nd layout (Greek in this example).
Temporary solution:
setxkbmap -layout us,gr -variant euro -option 'grp:alt_ shift_toggle, grp_led: scroll'
this command will set dual layout US Greek with Euro sign.
Putting it on Session autostart does not work since its overwritten by the bugged xfce layout,
so I made a launcher and I use it once per session when I need the 2nd layout (Greek in this example).