Stealth supersonic UCAV would be the 2nd step. The 1st step would be supersonic UCAV.
F-15, F-14, SU-30, SU-35, F-16, MIG-31...all of them are NOT stealth. And we are talking everyday in this forum (and previously in our dear and missed IMF) about Iran's needs in terms of Air Force, and purchasing SU-30 SM2, SU-35 etc etc which are NOT stealth.
So a supersonic UCAV with a J-79, with an AESA radar and armed with BVR AA missiles is not a silly thing as the 1st step to renew Iran's Air Force.
The manned fighters and/or stealth fighters would come in 2nd step.