Dear worm(proof), nice nick name, do you live in the USA or Europe, sorry, just a personal question.
The chord you mentioned is a very hard one, more it is just played for a very short period, and followed by a B7 chord, it is the famous Ebdim7 chord which is indeed very hard to play.
In most of the cases, when I encounter a chord like that, I first try to skip it, meaning that I don't play THAT chord and in 90% of the cases, where you see a chord like that, it will not harm the song if you play it. However, it is not for nothing that that chord is there, it will in most of the cases, just add a little bit more performing the song. I suggest to see the songs by Paul Simon, Elton John, because a lot of songs are written, or composed, using a piano or keyboard, and those are sometimes almost impossible to play. Another thing is that the song is often written for the "VOICE of THE PERSON WHO SINGS IT", for example, if you hear the voice of James Blunt, compared to Rod Stewart, it will be different. However, I have the complete Beatles collection in a book, and I am really scared to open it, because a lot of songs contain very almost impossible to play chords. I do agree that when you play in a cover band, the shadows, the beatles and you can read music and notes it is indeed a must. If you skip that Eb chord while playing and singing my sweet lord, I don't think that people will notice it. If you look for songs on this SUPER site, you have the possibility of TRANSPOSE chords. This is how I work, I look for a song and yes I found it, and not in tab form, but with chords on top. I see a lot of # or b, and difficult chords, I transpose them, one semitone higher or lower and you will notice often that you can play that pattern, without changing the song. It fits you to play and to sing.
I hope I could give you some help.