they did have some gba perks for the Oracle games, which by the way, cannot be accessed using the 3DS vc release.
If I remember correctly, it was just a special store that sold two GBA exclusive rings, one of which didn't even do anything. I wouldn't remotely consider that the same thing as reinserting Ice Climbers into the Super Smash Bros. roster.
Additionally, I'm not sure how that would even work. Would people only be able to play as Ice Climbers online and locally with other New 3DS owners? I doubt that's worth the effort.