I mean the reason they were removed is because of low popularity, so re-electing them is unlikely to do anything...
Way for #deletecandidate

We cannot bring variants back based on desires of players, we can only do it if it is played by players.
If many are interested in playing one of those variants, they are free to do so, the games are still rated, and if we see that one of the variants is actually actively played we will surely bring it back.
But if many are interested in just seeing that variant on the list, or it fails to attract enough players from the lobby, then we cannot consider bringing it back, unfortunately.
Except things like bughouse, crazy, koth, 3check, other special-rule games. But I HATE CUSTOM VARIANTS
We know that a variant will be hidden if it has the tag #deletecandidate, and what they (might) be soon deleted. But that's a bit ...unfair. They are just lack of popularity(bad variants will be just deleted or declined),not mean they're not high-quality.
So can we add a vote when necessary to show the #deletecandidate variants back in the menu without searching? The vote may be held once in 3 months,and the variant with the highest vote will be shown back.
Just a opinion though because not everyone search the tag if needed...