A 7 foot earwig at what age of development?
A 7 foot earwig egg would need a spatula the size and length of a university boat race oar.
A 7 foot adult earwig still has 6 legs, as per more normal size earwigs, so I would opt for several (well, 28 actually) flat cheese graters which I would lay out as 2 parallel lines of railway track. I would encourage the beast forward on to the track by dropping dahlia petals in its path. Sooner or later those 6 hooked legs would be ensnared into the sharp holes and I could claim the greater innovative solution.