MiG-31 is impossible now cause of zero documentations about engines, MiG-25PD is possible Iraq has manuals, but it will be useless.
MiG-25 is very specific interceptor, it was designed to intercept SR-71, but not to BVR. Foxbat is very fat and R-40RD/TD unmaneuverable.
better to add Su-15TM if you want interceptor, MiG-23ML will be nice cold era 3th gen fighter, MiG-27 or Su-17/22 as a strike aircraft, finaly Su-27S and MiG-29
oh yes i forgrot, MiG-25P was stolen in september of 1976 and USA got aircraft with all secret avionics