I don't know what inconsequential is to you. To me anything that reduces 0-60 time, negatively impacts handling and ride is not inconsequential.

As long as the total height of the rim and tire is greater, low ratio gears or otherwise, acceleration time from 0-60 is always reduced. An exception could be if there was one less shift before 60. Of course, the degree of impact depends on how much greater total height is increased.

You are correct that weight of rims is a factor. There might be taller rims/tires that are lighter weight and don't increase total height than what OP has, but, in comparison to other methods of filling the wheel wells it would be an expensive route to go.

__________________
X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas