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Another option is to go to the west of the city, motorway exit 81-Hamm/Bergkamen. Out of the city there leads Dortmunder Strasse. It is not that simple to get there with a public transport. You should get somehow to the bus stop "Quellenstrasse", from there every hour goes fast bus S30 (direction Dormund), you should get out on "Eckernkamp", the trip goes on for 6 minutes, but the distance is pretty long, wouldn't recommend to walk. Checking the bus schedule is possible here http://www.stadtwerke-hamm.de/metanavigation/fahrplanauskunft/.

There you can stand with or even without a sign, lots of slow traffic, enough space to stand on the hard shoulder, easy for cars to stop. The easiest lift is to the next gus station in Münster. Be careful that driver exits the motorway in Münster-Nord, not in Münster-Süd, as the petrol station is in between. But many cars drive further north as well.