The agm-122s are in fact anti-radiation[anti-radar] weapons and these werent converted from the regular ir homing sidewinders but from the sarh [radar guided] sidewinder variant.
The agm-87 was however converted from ir homing sidewinders but was used primarily against soft skinned vehicles and then only for a very short period probably because there were simply much better purpose designed A2G/ATGM weapons available.
I`m not arguing that you cant use these a2a missiles in another role as an ad hoc ground attack munition of sorts,but the simple fact is that they were designed to do a very,very different job entirely so their suitability in this role,especially as an A2A/ATGM is pretty questionable,altho I suppose that if you have large stocks of these weapons laying around and need to find some sort of a use for them that could be one possible option,but I think that with a specialised weapon like this ones options for re-purposing is pretty limited at best,altho personally I would have considered trying to upgrade them in the a2a role first.
Frankly this whole thing to me has the appearance of an answer in search of a question written all over it and I`m not particularly impressed with the result to be perfectly honest,tho what would`ve impressed me would`ve been seeing the iranian reverse/re-engineered spike copy,now that would`ve been good or better yet confirmation that the soumar LACM was now officially in service with the iri armed forces[sigh!].