I think I may be mistaken about the ability to swivel, although both the MiG 23 and it's derivative the MiG 27 had a wet pylon mid wing, but you are right, the inboard pylon is fixed.
Anyway, I stand corrected .. and I am sure one of our colleagues can fill in the blanks ...
so therefore no reason not to model it without the outer pylon..... or the MiG 27 either
G;