Highly doubt the P-15 narrow beam could accommodate superstucture+ mast mounted arrays. Topside weight with MF-STAR alone is massive (~1500kg per radar face iirc)
Besides, the superstructure/deck house is already sub-optimal with its two deck arrangement.
Power requirements will be significantly higher. For this reason, the USN came up with the new Flight 3 version of its workhorse Arleigh Burke class DDG.
Also, replacing the Zorya GT-53s with LM2500s would essentially mean a whole new ship class.