Sineva
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Even if you just used the 2nd,3rd and 4 stages that would still be a massive solid fueled icbm pretty much in the same class as the ss24 or mx,not to mention that the first stage of a solid fueled surush alone would have a diameter equal to the shuttles solid fueled boosters.Possibly Sarir SLV with 2.4 meter diameter is a Hwasong -15 (also 2,4 m diameter) which has RD-250 engine based on more efficient (compared to Simorgh) hypergolic propellant.
So Sarir might be a test proven Hwasong-15 + additional upper stage
This will allow Iran not just to develop more efficient SLV but also liquid fuel ICBM technology.
Surush 4 meter diameter first stage + 2m diameter 2nd stage + thirds and fourth stage
The second+thirds+fourth stage of Surush might be a potential solid fuel ICBM
I think the 4m surush is likely liquid fueled as this would allow the use of 4 rd250/paektusan motors which would give you the ability to put large multi ton payloads into leo.The 3m diameter tskylon 3 uses 3 rd250 variants for its first stage is able to put around 4000+kg into leo.
Another possible option would be to develop a liquid fueled twin chambered engine based on 2 4d10s from the khorramshar,the dprk was working on that before it was able to reverse/reengineer the rd250.