One wonders how feasible fitting a probe onto a P-8 would be. Well, I know it's feasible - anything is feasible, but at what cost? A reasonable job was done on the E-3D, after all. No idea how much it cost in shekels/time but I believe it used common plumbing from behind the 'AAR vagina' rearwards.
Also wonder whether a 'guided sonobuoy' delivery system is in the works. There's certainly a patent out there for such a system, as to how far development has progressed I know not.