Take a 1-1/2 inch length of Velox rim tape or adhesive cloth handlebar tape, trimmed appropriately for rim width. Put a small nail hole in the middle of the 1-1/2 inch tape. Lift your existing rim tape/rim strip and put the 1-1/2 inch "hole buffer" strip over the valve hole with the nail hole centered over the valve hole and replace your rim tape/rim strip back over the top. When you press the presta stem down through the new hole buffer, the cloth tape will insulate the rubber/valve interface from any sharp edges, but you might as well inspect the hole while you're in there, before you apply the new tape. If you don't have an appropriate file, you can probably just run an appropriately sized Phillips head screw driver up and down the hole to take of any burrs or rough edges.