Philip K. Dick is Dead, Alas by Michael Bishop
The Word of God by Thomas M. Disch
Pandemonium by Daryl Gregory
Anthology of short stories:
Welcome to Reality: The Nightmares of Philip K Dick edited by Uwe Anton
Edit: I removed Philip K. Dick High by David Bischoff because I’m not sure that PKD is actually a character in it. Maybe I’ll read it someday to find out. It was this review I was looking at and he mentioned a book of short stories I added to the list.