If it were me I would probably fill in the existing front hole in the stock with JB weld or similar to make it much, much easier to drill the new hole. The screw size is 1/4" so the hole isn't much more than that, and we're only talking moving the hole half of that (1/8") so the tip of your bit would be right on the edge of the old hole and just want to push into the old hole. Or you could just use a course 1/4" rat-tail file to elongate the existing hole rearward.
I've also seen a few people drill out the factory pillar and then make a new one with the hole off-set to move it the required 1/8".
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