Not sure how many routers can actually change 'above' the table. In any event, even with the Triton, you still have to lock off under the table and switch on the safety switch.
When the collet is fully wound up, it automatically locks and turns off power, so no chance in the router starting up again. Also an NVR supply would be additional safety for the school.
There may be others on offer in Canada or USA, but I dont know. Additionally, there are a number of bit extenders that can be fitted so that the bit height in other routers is much higher.