I'm currently leaning in a No Need to Do Anything approach as it's simplest, but looking at OSM, CalTrans uses a C/D system through the El Toro Y, with the C/D lanes being signed as I-5 and I-405 Truck through the interchange complex, and the mainlines not interacting with Exit 92B. While an argument could be made that the Newhall Interchange sets a precedence, in that instance I-5 Truck is a separate facility altogether, while here it's literally a C/D system straddling the mainline.