1) That "Journalist's Impression" must have been made with Heavy Afghan Resin. An asteroid like that would be the size of France and the impact would most certainly not look like a plume from a depth charge with a kind of shockwave around.

2) Breaking up a 'roid with "electromechanical devices" is going to take some serious energy I would imagine. I hope that idea does not come from the corner of the crowd who want to to break up the Earth with a device Tesla invented in 1910 and which feeds on two car batteries but produces "resonances".

3) Otherwise the Mylar idea sounds interesting, you have to wrap the object early enough to get good leverage though.