There are lots of things I would do to get home if I broke down in your Outback...like, wedging a broken CV joint with the jack to lock that axle and limp home with one wheel driving...or putting cooking oil in my brake system to act as hydraulic fluid...
Then it would get properly fixed when back at a garage!
I think that cooking oil is likely too viscous (at room temp...worse in the cold...it turns to solid at low temps) for most brake systems, particularly ABS modules...emergency procedure at best...