I have a couple of 'Gordon' covers, Dylan's Early Morning Rain, so so, Tony Rice's CD which I quite like. Ian & Sylvia's EMR and For lovin' Me, passable. However I do not know if William Shatner has covered any 'Gordon' song. Having heard the demolition job he did on 'Lucy In The Sky With Diamonds'I sincerely hope not. A British MOR singer, Michael Ball did a reasonable job on IYCRMM a little while ago. You can hear a clip at.
http://www.michaelball.co.uk/music/
Look for the cd "First Love" there is an 18 second clip. Borrowing heavily from the Lighfoot arrangement.