I will tell you want he should do next!
1) Make a list of exactly what it takes to make a clock like this
2) Talk to his friends, who talk to their friends, etc. and spread the list
3) Have as many of the high school students show up at a location on a Saturday and all build clocks
4) Have all of these students show up at school on Monday with their clocks
5) Have all the kids en-mass show their teachers the clocks they made right as school is starting. Make sure they all know, it is a clock.
6) Wait for the administration and police to react.
Problem solved. they can't suspend that many kids at once. The Police can't handle that many kids at once. If they don't respond the exact same way as they did to the first clock, then the lawsuits will fly! They can't respond to that many clocks being brought to school in the same manner so the police and school then have to say, yeah, it isn't that big a deal or they have to let their true crazy shine!
I think you maybe even get as many of the parents as you can to show up at school drop off with clocks as well!