At Risk of dateing myself again.....

Kids will find a way to watch TV. Its the Parents responsibility to keep an eye on what the kid is watching.

We didnt have cable TV when I was a kid.... So I Hacked together a box to Descramble ONTV/Sportsvision here in Chicago (That shouldnt be againts any forum rules... There gone/boughtout now and the Statute of limtations is Way up on aggressively borrowing those services)

If its gotta be done, put the switcher in a locked ChannelVision panel or the like.... At least this will make it that much more difficult to bypass.