If you don't need to reuse them and have access to a welder, weld a nut onto the end and put a regular socket on it to get it off.
find a 2 point socket thats slightly smaller but will be able to be hammered onto the nuts, it will take them right off
You mean 6 point.
take it to a tire store. they have a "wheel lock removal kit". if you go inside they will want to charge you $50+. just talk to one of the techs. most techs will take them of for you if you give 5 or 10 bucks. or you can go to napa and buy a bolt extractor, its basicly a socket with left handed flute on the inside.