Re, training IR pilots and access to Sims abroad, incidentally the only functioning sim Iran Air has running in THR is a B727 sim.( I have been having some nostalgic sessions on it a year ago).
Re CAT 2 ops, if the aircraft that crashed had the same cockpit avionics as the sim, there is no flight director, no FMS and no integrated GPS. Just a basic and simple good old 727-200.
Spares is a huge problem. They get them at inflated prices and not always 100% tracable. Technical problems are one of their main problems and I would not be surprised if technical issues forced the go around.
The IR 727s are normally not used, just like their 2 747SPs ,only as Stand by spares I was told. On their published schedule the flights to that destination are (normally) all operated by F100 and A320s.