EP-8 anyone? Model using a lot of the EP-3 "lumps and bumps" on a P-8, or equivalent, airframe. One of my former employers, L-3 Communications, Integrated Systems Division, would be perfect to produce this; besides the USAF/RAF "Rivet Joint" aircraft, they maintain, update, and convert the USN's EP-3 fleet and they've got plenty of experience on 737/BBJ completions.
For that matter, how about P-8 style wingtips or 737-style winglets on CFM-56 powered 707's with whatever electronics fit works withthe backstory?