My steering wheel.was in the same condition as yours, with separated cracks and a chunk off the center identical to yours.
I ended up trying JB Weld to glue it together and fill all the crack. I sanded it and added more JB Weld - like it was Bondo.
I was the one most amazed that it actually worked extremely well. Primed it with plastic adhesion primer and painted it with base coat/ clear coat. I have had zero issues.
View attachment 1715397560
