If it didn't have a weighthole, you would be fine as that hole could be considered a weighthole. Plus, you won't feel the back of the hole so even if they touch, you should be fine.
But, having said that, I wouldn't try it until you've talked it over with your pro and tried to find out how it will improve your game (if it will help at all). Just because it works for one guy does not you need to try it out.
The grip will also probably change your pap, causing the pin to be in a slightly different location relative to that. Not a big deal, shouldn't be a big reaction problem, but don't do this on a ball you throw regularly. Just use it as an experiment if you do this at all.
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stanski