I always carry some 1/4" nylon rope. One use is to tie a loop to turn just the water-pump pulley. I did that when my alternator bearing seized, squealing the belts. Trick is to tie a barrel knot (like fishing) and get the rope taught. If you get the diesel started, you won't need any more battery until you get home, unless driving at night. Hitting 120 C for a short time will not hurt the engine. Indeed, the temp sensor in my 1984 & 85 300D's will show excessive temp from just an air pocket by the sensor.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans