Just to add that the TERMA ECM/RWR suites that equip part of Viper fleet (MLU’s plus more; ) do have 3D audio feedback directly to pilot helmet audio headset. What is actually doing is increase pilot 3D immersion on the threat quadrant aspect, so pilots is always aware from where a missile is approaching as he maneuvers so to better react in 3D.
Although not the initially asked feature about radios in 3D, this would indeed could be an extra feature request for real world ops to help improve SA and comms.