What remedial measures could be put in place to bring the radio stations in line with the Shariah?

Answer

Forget about remedying the miscreant shaitaani radio stations and the ignorant jamiats. They are beyond redemption. There is no hope for reforming Iblees and his legions. The radios were evil from their very inception. The Jamiats have drifted from Siraatul Mustaqeem. They have abandoned Amr Bil Ma'roof. We have repeatedly criticized them for their evil. Now, only Allah Ta'ala can remedy them, either changing their hearts or with His Punishment.