Why not IRAN put a request for acquiring F-4, F-5 and F-14s along with spares in the global market. Also, start negotiation with US and other operators; for F-14s it's only the US that can supply spares but for for F-5 and F-4 there are many of them.
On F-5, F-4 and F-14s, IRIAF has a great experience of many decades and still they can use it for another 7-10 years with upgrades to avionics. In this mean time they can go for JV with China-Russia over a new plane too. So, these upgraded F-4, F-5 and F-14s can easily guard the skies and seas along with some used MiG-29s from Russia and other operators too.