Can't remove the door but could reverse it and thereby gain about a foot.
I have to be honest...... I am more confident that the space apart will not be a problem. Maybe I am just less sensitive to this?? The person in the room next door has fantastic musical hearing and he also does not notice a problem......
I remain hopeful. I'm guessing that the 'imaging' may be a little less than optimal but if I get the dynamics and so forth right, well that just might do it.