I've never heard of this rule variation in 8-ball offered before. I like it!Too confusing for the viewer.
How about moving the break back? It is now required that one break with the cue ball starting behind diamond six, which is where the head-string is located.
If players were required to break from behind diamond seven, it would make the game more difficult than it is today and the game would remain recognizable to those who play the conventional version of the game.