This is a rewrite of “Once in Royal David City”. I don’t think I would risk it but you may be made of sterner stuff. I worry that Christmas carol parodies are an accepted bad taste trope that might warp this song’s reception.
You can purchase Heaven Shall Not Wait at Wild Goose.
The text is in this bulletin. This post describes a mixed response to its use.
Since there are no videos of this song I will substitute the genius of Stan Freberg.