I've done with with pin blems (ones that have 7"+ pin out distances.. draw a line 13.5" from the pin through the cg and use that "mark" as the 180pin.. then just lay the ball out as you regularly would.  I think the only issue with shorter pin to cg distances (regular good specs) is that you would end up with something like a 6.5"+ 180pin to cg distance.. might be tough to get the statics correct.  Otherwise they should roll alright (but differently).

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“You can be with the guy and in his ear 24 hours a day, but at the end of the day you can’t be there the whole time.”
- Another Gem from Emmitt Smith 5-6-08

This is precisely why I DIDN'T flip my 11.5-inch pro-pin Paradigm over. If I'd flipped it over to drill the negative pin, I would have inverted the core and changed the location of both the flip block and the mass bias. As it is, I have a ball that rolls completely different from my "stock" Paradigm or from anything else I own, for that matter. And it's statically legal.

Jess