nineTHRTY
I'd guess hopeless. the lockscreen would have to be customized for this or create a shim. Knowing the name of the current song without unlocking the phone is probably their last priority behind security & privacy. They are generally hesitant to change a lot of AOSP and would prefer the changes to be added into AOSP.
Maybe another song identifier has a quick tile to improve speed.
I don't speak for GOS, opinions are either my own or from the CIA mind control device.