EAP was a technology demonstrator aimed at minimising some Typhoon technical risk. A new control system in conjunction with FBW Jaguar, novel aero configuration, and materials manufacture.
If such a route was chosen for Tempest, then what would a fast track demonstrator investigate.
Considering the current trend for lengthy programs, perhaps a reduced time scale - real fast track manufacture. Alternative, an adaptive capability for emerging, as yet unforeseen roles, strategies (defence review), new technologies or weapons - aspects beyond a foreseeable stretch / update of Typhoon.