How about going the other direction...the breaker gets to shoot after the break, made ball or not. And leave the option to push out. Of course, you'd have to allow alternate break or it would simply be a runaway. And make the race 20 or more.
Seems to me with the mandatory first shot push out, you don't even care if you make a ball (Might even be better to safety break). My option wouldn't require you to make a ball either, but you'd see some more creative breaks. At least with my suggestion, you would get to see some ball making and probably not too much safety play...but what safety play you would see would be very good. The whole match would go much quicker too, so a race to 20 wouldn't take all night.
Just my radom thoughts while sitting here bored at work.
L8R...Ken