could use that stuff, not sure how long it would work though. Like most people here, i only reccomend what i myself have used and know to work. That way, i know i'm not going to say somthing stupid and cause someone more work than is neccesary.
The light cord works, as it is "Almost" the same, if not THE same stuff as is originally in the pulstarter. Besides which, if you can get aweay with it, you can also make the string a bit longer than it was originally.
I always have an extra 2 or three pull cords in my spares box, mainly because i can get two pull starter cords out of one length. Therefore with 2 or 3 spare pull cords, i have 4 to 6 spare pull starter cords in stock at any one time.
I Also carry at least one spare complete pull starter unit to swap out. That way, i can repair the "broken" one after i finish running and still have a complete one ready and waiting, and not have to end my bashing session due to a broken pull starter cord.