I had to learn how to do this when the slave cylinder blew on my volvo 740, whilst towing a trailer, with a car on the trailer, in Belgium, starting uphill, on a motorway in rush hour with no breakdown cover.
And i still had to deliver the car to it's destination (a service station), and get back home to northampton. Getting on and off the ferry was the nerve wracking bit. By then i had learnt the clutchless technique, but i daren't tell anyone i had a problem in case they didn't let me on.
It started uphill on the starter surprisingly well, but i was worried about burning out the starter cos then i would be totally screwed.
must have done about 300 miles like that.
then it did it again a few days later when i was returning the trailer, but by then i was an expert.