I'm not sure how it was achieved, but I have seen PCs before that went against the default PC heights.
If this is true, wouldn't it be theoretically possible to simply scale up the elven model slightly to balance it out a bit again.
(Unless this actual size change was merely a specific model change instead, in that case ignore my comment.)
Not saying this should be requestable anyhow, as then everyone might start requesting height changes.
But it could be a potential, temporary, alternative solution if the DM team wants taller half-elves with pointed ears that are still rather frail. Who knows?