Ther Command Eject on the Hawk was set up based upon the needs of a 2 seat training aircraft, with the instructor in the rear seat able to initiate it. Its a relatively simple system with hot gas from the rear seat used to initiate the front seat via pipes.
I believe there is a need for the RAFAT to carry their engineers in the back seat when deploying away from base so it would make sense for their jets to receive a mod that allows front seat initiation of command eject. In theory of course this should be straight forward and relatively inexpensive. I suspect however that between British Aerospace, Martin Baker and the RAF the cost would escalate to the extent that it would prove cheaper to provide a support Herc for every deployed display. Oops, cost just going up a wad as it would have to be a support A400!