I was following this thread in silence, but someone talked about me, so I was forced to post... (^^,)
I have The Exorcist on laserdisc (only pan & scan) - could be useful for its soundtrack, and the PAL DVD director's cut - don't know if its color grading is the same of the BD or not.
Well, if I have understood well, the video of BD is good except color grading, and the final scene; the audio could be taken from the P&S DVD, plus a laserdisc soundtrack is not a bad idea; the colors from 1997 LB DVD; the final scene from Terror in the Aisles... I think we have a restoration project, guys!