I am most appreciative of this thread and the response.
I adore Beethoven, and liturgical music probably takes up a quarter of my music collection. But I have never found a Missa Solemnis that did the trick for me. I have to force myself to sit through the entire work.
I suppose if anyone could do it, it would be Klemperer.
I've often wondered if the problem is that LvB just did not have the spiritual depth of Bach or Bruckner. But, neither did Brahms or Mozart, and they managed to pull it off.
I will give the Klemperer a try.