Williebetmore reply seems best to me ! But as many other players, I sometimes refuse to leave a long distance break shot from the kitchen, especially if I haven't warmed up yet. So, I want to point out that there are a few different ways to bump a new break ball. Danny made a good point that you can also bump the break ball under the rack.
Personally I don't particularly like this, to me it seems it's too easy to leave the cueball in the wrong side of the break ball or maybe even straight in.
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I think this is easier, to play a fuller bump to the 10-ball and force it to the long rail and back. You don't have to have a perfect thin bump to the 10-ball and you can use a little bit of stroke. This is easier than it looks !
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I think Danny proposition was a good one, but seems like you'd need to get a perfect angle to bump the 12-ball under the rack with position. But, my position play usually sucks anyway, so that might be the reason...
Thanks for a good question SJM ! I always enjoy reading these "what would you do here" -threads.