Of course, you have full terminal access. Although you might find autofs to be better to use for your system mounts.
Yes. You can use the backup/restore function in the My OSMC add-on to migrate your database as well as most of your other userdata. The only exception would be that you should not try to migrate guisettings.xml since you are changing platforms. On the new device before you restore from the backup you can just make sure to uncheck that file and you should be good to go.