Yeah each would need another prefect escorting them to the place if it was off campus, or escorting lelouch to Conquest if it were a conquest only fight. They would also have to ask someone to send a message through the network to organise Lelouch to come as neither of them can use the interschool network.

So it is feasible but Suzaku probably wouldn't ask for help unless he was desperate and of course, no plotting of any kind would happen at all